The Tumen River (圖們江, Tumenjiang) is located in Northeast Asia.
It forms the border between China and North Korea in the upper reaches and between North Korea and Russia at the mouth.
The Tumen River originates in the Changbai Mountains and flows 521 km long into the Sea of Japan.
... has an excretory function in both sexes, to pass urine to the outside, and also a reproductive function in the male, as a passage for sperm.
The external urethral ...