The Boiling Pool at the foot of Victoria Falls. In the background is the bridge connecting Zambia and Zimbabwe.

Luther Htoo (centre), a member of the KNDO ethnic armed group, waits on a bank of the Toei River in Thailand to be smuggled across the river into Myanmar.

John Henry Newman (left), a member of the KNDO ethnic armed group and the PDF (People's Defence Force), waits on the banks of the Toei River in Thailand with other people from Karen ethnic armed group...

John Henry Newman, a member of the KNDO ethnic armed group and the PDF (People's Defence Force) walks through no man's land between the Thai and Myanmar border before being smuggled back into Myanmar.

A man takes a picture from the Shenzhen Bay promenade with a view of Hong Kong across the water.

Dissident Iranians train with armoured vehicles near the Iraq/Iran border.

Rwandans who fled, post the 1994 genocide, into Zaire head back across the border two years later on the orders of Kabila's new government who decided refugees from Rwanda have to return home.

A baby lies beside its mother who has died from cholera in the Munigi camp which housed Rwandans fleeing to Zaire (DRC) following the 1994 genocide.

A baby clings to its mother who is sick with cholera in the Munigi camp which housed Rwandans fleeing to Zaire (DRC) following the 1994 genocide.

Rwandan refugees, including Hutus, flee into Zaire (DRC after 1997) in th eviolent aftermath of the Tutsi genocide

People on the Shenzhen Bay promenade with a view of the city beyond.

Traveller's walk towards a border crossing with Hong Kong.

Traveller's walk towards a border crossing with Hong Kong.

A woman holds a baby in an exercise yard next to a barbed wire fence near the border with Hong Kong.

A van moves down an access road alongside a swimming pool and a barbed wire fence near the border with Hong Kong.

A swimming pool beside a barbed wire fence near the border with Hong Kong.

Blankets airing on a washing line attached to a barbed wire fence near the border with Hong Kong.

A barbed wire fence stands near the border with Hong Kong.

Men rides past a barbed wire fence near the border with Hong Kong.

A woman walks on the North Korean side of the border fence in the town of Hyesan, seen from across the border in Changbai.

A view of the town of Hyesan, North Korea, seen from across the border, formed by the frozen Yalu River, in Changbai.

A woman walks on the North Korean side of the border fence in the town of Hyesan, seen from across the border in Changbai.

A soldier walks on the North Korean side of the border fence in the town of Hyesan, seen from across the border in Changbai.

A view of the town of Hyesan, North Korea, seen from across the border, formed by the frozen Yalu River, in Changbai.

A barbed wire fence running along the border crossing in the town of Changbai on China's border with North Korea.

A woman walks past construction cranes in the town of Changbai on China's border with North Korea.

Eternal President Kim Il-sung and Supreme Leader Kim Jong-il (right) look out towards the border with China from the town of Hyesan in North Korea, seen from across the border in Changbai.

Eternal President Kim Il-sung and Supreme Leader Kim Jong-il (right) look out towards the border with China from the town of Hyesan in North Korea, seen from across the border in Changbai.

A view of the border crossing in Changbai, on China's side of the frontier with North Korea.

A view of the town of Hyesan, North Korea, seen from across the border in Changbai.

A soldier, stands and looks on as women wash clothes through a hole broken through the frozen surface of the Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

A soldier in the town of Hyesan, North Korea, seen from across the border in Changbai.

Women, overseen by a soldier, wash clothes through a hole broken through the frozen surface of the Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

A view of the town of Hyesan, North Korea, seen from across the border, formed by the frozen Yalu River, in Changbai.

A woman carries a bucket of laundry towards a hole broken through the frozen surface of the Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

A woman carries a bucket of laundry towards a hole broken through the frozen surface of the Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

A woman carries a bucket of laundry towards a hole broken through the frozen surface of the Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

A view of the town of Hyesan, North Korea, seen from across the border, formed by the frozen Yalu River, in Changbai.

Cyclists on the North Korean side of the border fence in the town of Hyesan, seen from across the border in Changbai.

A soldier, stands and looks on as women wash clothes through a hole broken through the frozen Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

A soldier, stands and looks on as women wash clothes through a hole broken through the frozen Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

A woman carries a bucket of laundry towards a hole broken through the frozen surface of the Yalu River in Hyesan, North Korea, seen from across the border in Changbai.

Two boys play outside in the town of Hyesan, North Korea, seen from across the border in Changbai.

A long line of cars leading to the border crossing stretching for more than five kilometres. A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the Shehy...

A family from Odessa take a break to eat some food and rest before joining the long queue waiting to cross into Poland. A crowd of several thousand or more, mainly women and children, queued up in the...

A family from Odessa take a break to eat some food and rest before joining the long queue waiting to cross into Poland. A crowd of several thousand or more, mainly women and children, queued up in the...

People wait to to receive free food distributed by a volunteer group near the border crossing. A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the She...

People wait to to receive free food distributed by a volunteer group near the border crossing. A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the She...

A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses t...

A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses t...

A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses t...

A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses t...

A crowd of several thousand or more, mainly women and children, queued up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses t...

Four year old Anhelina, from Poltava in north eastern Ukraine, waits to cross into Poland with her mother and other family members. A crowd of several thousand or more, mainly women and children, queu...

Daryna and her older brother Ilya, who fled their home in Kyiv, wait in line with their mother to cross into Poland. A crowd of several thousand or more, mainly women and children, queued up in the fr...

A crowd of several thousand or more, mainly women and children, queue up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses to...

An Ukrainian refugee family wait to cross the border into the United States at an encampment near the San Ysidro border crossing.

A crowd of several thousand or more, mainly women and children, queue up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses to...

Ukrainian children play and eat tacos while they wait to enter the United States at the San Ysidro border crossing. Volunteers, many of them Ukrainians living in the United States have helped establis...

A volunteer gives a Customs and Border Protection (CBP) officer passports of Ukranians looking for asylum in the United States at the San Ysidro border crossing. The CBP has been making exceptions o...

Ukrainian refugees gather at a tent where volunteers are organising lists of Ukrainians waiting to cross into the United States. Volunteers, many of them Ukrainians living in the United States have he...

Volunteers organise lists of Ukrainian refugees waiting to cross into the United States at an improvised camp near the San Ysidro border crossing. Volunteers, many of them Ukrainians living in the Uni...

A crowd of several thousand or more, mainly women and children, queue up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses to...

A volunteer manages a list of Ukrainian refugees waiting to cross into the United States at an improvised camp near the San Ysidro border crossing. Volunteers, many of them Ukrainians living in the Un...

A tent used by Ukrainian refugees waiting, in an improvised camp, to enter the United States near the San Ysidro border crossing. Some Ukrainians have been travelling for over a month to reach the bor...

A crowd of several thousand or more, mainly women and children, queue up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses to...

Two Ukrainian refugees rest in the sun while they wait to enter in the United States at an encampment near the San Ysidro border crossing.

Tatiana Pylypchuk (25), Elizabeth Babiychuk (22) and Mariia Verkovska (27) wait to cross the border into the United States at an encampment near the San Ysidro border crossing.

Tatiana Pylypchuk (25), Elizabeth Babiychuk (22) and Mariia Verkovska (27) wait to cross the border into the United States at an encampment near the San Ysidro border crossing.

Ukrainian refugees wait to cross the border into the United States at an encampment near the San Ysidro border crossing where some Ukrainians have arrived after travelling for over a month.

A crowd of several thousand or more, mainly women and children, queue up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses to...

Ukrainian refugees wait to cross the border into the United States at an encampment near the San Ysidro border crossing where some Ukrainians have arrived after travelling for over a month.

An Ukrainian flag attached to the border wall of separating the United States and Mexico.

Ukrainian refugees wait to cross the border into the United States at an encampment near the San Ysidro border crossing where some Ukrainians have arrived after travelling for over a month.

Valentina Shymanservska rests at the encampment near the San Ysidro border crossing with the United States where some Ukrainians have arrived after travelling for over a month.

Ukrainian residents from the United States, who have crossed the border into Mexico, distribute food for Ukrainian refugees at an improvised camp near the San Ysidro border crossing. Volunteers, many...

Ukrainian refugees rest at an encampment near the San Ysidro border crossing. Volunteers, many of them Ukrainians living in the United States have helped establish the camp that provides clothes, food...

A crowd of several thousand or more, mainly women and children, queue up in the freezing cold at the Shehyni border crossing between Ukraine and Poland, waiting to cross into Europe on foot. Busses to...

Ukrainian refugees wait at an improvised camp at a bus station while they wait to enter the United States near the San Ysidro border crossing. Some Ukrainians have been travelling for over a month to...

A Mexican police officer poses beside an Ukrainian refugee while she waits to enter in the United States near the San Ysidro border crossing.

Mariia Porplenko (19) holds her 8-month-old niece, who lives in the United States, for the first time as she arrives at an encampment near the San Ysidro border crossing where Ukrainians, many who hav...

A woman rests as behind her a people wait to cross the border. A crowd of several thousand or more, mainly women and children, queue up in the freezing cold at the Shehyni border crossing between Ukra...

A Russian child holds her mother after they were rejected from entering in the United States at the San Ysidro border crossing.

Ukrainian children play at an improvised camp while they wait to enter the United States at the San Ysidro border crossing. Ukrainian refugees are arriving every hour or so, some of them sleep in the...

A person is carried ashore at Dover Harbour by a crew member from HMC Valiant after a group of migrants were picked up from the English Channel by the UK Border Force.

A person is carried ashore at Dover Harbour by a crew member from HMC Valiant after a group of migrants were picked up from the English Channel by the UK Border Force.

A person is carried ashore at Dover Harbour by a crew member from HMC Valiant after a group of migrants were picked up from the English Channel by the UK Border Force.

A man and a child come ashore at Dover Harbour from HMC Valiant after a group of migrants were picked up from the English Channel by the UK Border Force.

Immigration officers in Dover Harbour where a group of migrants enter a bus after coming ashore from HMC Valiant after the UK Border Force picked them up from the English Channel.

A man and a child come ashore at Dover Harbour from HMC Valiant after a group of migrants were picked up from the English Channel by the UK Border Force.