Zorkul (Dari: زارکول; Pashto: زارکول; Tajik: Зоркӯл, romanized: Zārkul) is a lake in the Pamir Mountains that runs along the border between the Wakhan District in Badakhshan Province of Afghanistan and the Gorno-Badakhshan autonomous region of Tajikistan.

Lake Zorkul extends east to west for about 25 km (16 mi).

Out of the lake, towards the west, flows the Pamir River, tracing the Afghan–Tajik border.

The lake and river were established in 1895 as the new frontier between the Russian Empire and the Emirate of Afghanistan.

A general treaty of friendship was signed between the two powers, agreeing that the lake area would be a nature reserve, and that neither empires will post national or international military forces within a certain distance of the frontier, nor establish settled communities in the area.