Kherlen

The Kherlen River, also known as the Kerulen, originates on the southern slopes of the Khentii Mountains, near Burkhan Khaldun Mountain, within the Khan Khentii Strictly Protected Area. The river travels east through Khentii Province before traversing the eastern Mongolian steppe and entering China. The river runs 677 miles from its headwaters to its mouth at Hulun Lake, which is located in China's Inner Mongolia area.

The river begins on the south slopes of the Khentii mountains, near the Burkhan Khaldun peak, in the Khan Khentii Strictly Protected Area, approximately 180 kilometers or 112 miles northeast of Ulaanbaatar. This area is known as the "Three River Basins" because it separates the Arctic (Tuul River) and Pacific (Kherlen, Onon) basins. The Kherlen runs largely eastward via the Khentii aimag from there. It continues across the eastern Mongolian steppe, passing through Ulaan Ereg and Choibalsan before entering China at 48°3′N 115°36′E and draining into Hulun Nuur after another 164 kilometers or 102 miles.

Length: 1,090 km