The Iranian photographer reveals the dangers posed to fishermen and farmers by the polluted water in which he used to swim

The world’s largest enclosed body of water, the Caspian Sea, is surrounded by jeopardies. Declining water levels from global heating have been exacerbated by increasing levels of extraction from the Volga and the Ural, the Russian rivers that flow into it. Satellite photographs show the sea shrinking at a dramatic rate. And each year increasing levels of pollutants from the five coastal states that border the Caspian contaminate it with spills from growing numbers of oil and gas fields, and with industrial and domestic waste from expanding coastal towns and cities, a magnet for internal migration.

The Iranian photographer Khashayar Javanmardi grew up on the shores of the Caspian Sea in northern Iran and used to count the hours at school before he could return to swim in it. He has spent the past few years, however, documenting the environmental decline along its coastline.

Caspian: A Southern Reflection is published by Loose Joints (£44)