the Guard District maintained a small garrison force of ships and Naval Land Forces which reported directly to the Guard District commander, and hosted detachments of the numbered fleets on a temporary assignment basis.
The port of Chinkai in Korea was an area with long associations with Japan, having been the location of a Japanese trading settlement in the 15th and 16th centuries.
The port was upgraded to a Guard District on April 1, 1916; however, after the Russo-Japanese War it lost most of its strategic importance and was regarded as somewhat of a backwater assignment.
[3] On the surrender of Japan, Chinkai was occupied by Destroyer Squadron 64 from the United States Navy led by the USS Harry E. Hubbard (DD-748).
A subsidiary naval base reporting to the Chinkai Guard District existed at Rashin (present day Rason, North Korea), 42°20′02″N 130°23′56″E / 42.334°N 130.399°E / 42.334; 130.399 (Rason, NK), on the east coast of Korea near the border with the Soviet Union.