Seals, caviar and oil: Caspian Sea under threat from pollution Bordered by Azerbaijan, Iran, Kazakhstan, Russia and Turkmenistan, the 1,000-kilometre-long Caspian is the world's largest inland body of water. It is home to a range of native species -- from the seals to Caspian turtles and the famed beluga sturgeon -- and also to vast energy reserves, estimated at 50 billion barrels of oil. But pollution from the extraction of that oil and gas, along with declining water-levels due to climate change, has left many species under threat and the future of the sea itself at risk. IMAGES of Caspian Sea pollution, of fishermen fishing and SOUNDBITES of environmental activists and a fisherman