Sea kayakers beneath the largest sea cliffs in the UK at Conachair on Hirta, the largest island in the St Kilda archipeleago. The archipelago lies, isolated, in the Atlantic 40 miles off the western isles of Scotland. It is a dual UNESCO World Heritage site for Cultural and Natural importance. The archipelago, of small, steep volcanic rock, holds the largest colonies of Gannet in the world, the northern hemisphere's largest sea bird. Humans have lived here for centuries enjoying fertile soils and a mixed diet of seabird meat, seafood, livestock and crops. Hirta supported around 180 people at its peak but the island is now all but abandoned, the last residents having left in 1933. Today a radar station employs a around a dozen staff year round and they are joined by a number of volunteers for the National Trust for Scotland who tend the village in summer.