A pump used to move water from deeper places to the shallow beachside for people to swim. It no longer works because the deep parts have also begun to dry. Sharafkhaneh Port, Iran.Iran's Lake Urmia was once the second-largest saltwater lake in the world, covering more than 2,000 square miles at its deepest in the 1990s. In the past two decades, the lake has dried out, shrinking at times to less than 20% of its average size. It's not a story of climate change, though that certainly contributed.