The North Korea–Russia border, according to the official Russian definition, consists of 17.3 kilometres (10.7 mi) of "terrestrial border" and 22.1 km of "maritime border". It is the shortest of the international borders of Russia.

The Tumen River, also known as the Tuman River or Duman River, is a 521-kilometre (324 mi) long river that serves as part of the boundary between China, North Korea (right) and Russia (left), rising on the slopes of Mount Paektu and flowing into the Sea of Japan. The river has a drainage basin of 33,800 km2.