China–North Korea–Russia tripoint

Three granite shoreside markers,[1] which are in effect triangulation stations, are specified in the 1985 treaty defining the tripoint, which is "a straight line running along the perpendicular from border sign No.

"[2] The terrestrial boundary between Russia and North Korea runs along the fairway (thalweg) of the Tumen River and its estuary, whist the maritime boundary separates the two countries' territorial waters in the Sea of Japan.

[2] A separate, trilateral treaty specifies the position of the tripoint of the borders of Russia, North Korea, and China.

The main Russian border guard station in the area is Peschanaya.

One interpretation of various treaties is that a China–North Korea border zone exists in the river (or even an international condominium), in which case there would not be a point where all three countries' sovereign territory meet.