Kara Kul Lake

Tajikistan / Gorno-Badakhshan / Murgob /
 salt lake, astrobleme
Kara-Kul is a 25-kilometer (16-mile) diameter lake in the Pamir Mountains in Tajikistan, and lies at an altitude of 3,900 meters (13,000 feet) above mean sea level. Kara-Kul was formed by a meteorite impact event less than 5 million years ago, leaving a crater with a rim diameter of 45 kilometers (28 miles).

A peninsula projecting from the south shore and an island off the north shore divide it into two basins, a smaller eastern one which is shallow, 13 to 19 meters, and a larger western one, which has depths of 221 to 230 meters. It has no drainage outlet. Interestingly, the Kara-Kul impact structure remained unidentified until it was discovered though studies of imagery taken from space.
Wikipedia article: http://en.wikipedia.org/wiki/Karakul_(Tajikistan)
Nearby cities:
Coordinates:   39°0'38"N   73°25'34"E