The Naryn is a river in Eastern Kazakhstan, a tributary of the Irtysh, originating at the junction of the ridges Narym and Sarymsakty of wetland formed by the mountain runoff streams. With its low headwaters and smooth clay-sandy bed, the width of the river valley at places extends to more than 20 kilometres (12 mi); in some places it narrows to 25 to 250 metres. The width of the river is 15 to 25 metres, and the depth varies from 0.5 to 2.5 metres.