Along Iran's northern coast, the Caspian Sea is vanishing so fast that fishermen say they can measure the loss in a single season. Ports that once bustled with boats now sit hundreds of meters from the water's edge. The world's largest inland body of water is retreating in real time.
A coastline that keeps moving away
In the Iranian port of Bandar Torkaman, the sea has pulled back so far that fishing boats can no longer reach the water. Locals told DW that the shoreline has receded by several hundred meters in recent years. Where nets once dropped into deep water, there is now dry, cracked ground. The change is not gradual. It is visible from one fishing season to the next.
Iran sits on the southern rim of the Caspian. The sea also borders Russia, Kazakhstan, Turkmenistan, and Azerbaijan. But for Iranian fishermen, the loss is immediate. Their livelihoods depend on a body of water that is shrinking faster than anyone expected.
Why the water is disappearing
Scientists point to a combination of factors. Rising air temperatures increase evaporation. Dams on rivers that feed the Caspian trap water that once flowed into it. And less rainfall means less replenishment. The result is a steady drop in water levels that has accelerated in the past decade.
Satellite data shows the Caspian's surface area shrinking. The decline is not uniform around the coast, but the shallow northern and eastern edges are hit hardest. In Iran, the gently sloping seabed means that even a small drop in water level pushes the shoreline far inland.
A fishing industry running out of sea
For the people of Bandar Torkaman, the crisis is not a future prediction. It is happening now. Fishing boats sit idle. Docks are stranded. The catch has fallen sharply. Some fishermen have abandoned the trade entirely. Others try to follow the retreating water, launching boats from makeshift beaches far from the old port.
The local economy revolves around the sea. When the water goes, so do jobs. Markets that once sold fresh sturgeon and caviar now offer less. The Caspian is famous for its beluga sturgeon, which produce the world's most prized caviar. But as the sea shrinks, the fish habitat shrinks with it.
What happens when a sea disappears
The Caspian Sea is not an ocean. It has no outlet. It relies entirely on river inflow and rainfall to maintain its level. When those sources dwindle, the sea has no way to recover. Scientists warn that the trend could continue for decades.
For now, the people of Iran's Caspian coast watch the water recede. They adjust their nets, move their boats, and hope the sea stops pulling away. But the shoreline keeps moving, and there is no sign it will stop.
