Belosaraiskaya Kosa (Belosaraisk Spit) is a sand spit extending into the Sea of Azov, located between Mariupol and Berdyansk in the Donetsk Oblast. It is a renowned kitesurfing spot thanks to its shallow waters and wind exposure.

The Sea of Azov is characterized by very shallow and warm waters in summer (up to 28°C). The sand spit allows riding on both sides depending on wind direction: the open sea side with some chop or the lagoon side with flat water.

The bottom is sandy, ideal for standing. The prevailing wind comes from the southwest and west.