Gan

The Gan River rises in the wooded Greater Khingan and winds southeast to join the Nen. Tributaries including the Ali and Keyi carry water from surrounding valleys into its course. Larch and pine cover much of the mountain country, and long winters close the river with ice. The Gan is one of the major western tributaries of the upper Nen, gathering streams from a broad forest region before they enter the larger river.