Lake Khasan is a small lake in Khasansky District, Primorsky Krai in eastern Russia. Located 130 km southwest of Vladivostok. To the east is the Tumen River. In English, also spelled "Lake Hasan". Today, Lake Khasan is located in Russia near the border with China and North Korea.
Battle of Lake Khasan / Changkufeng Incident
Known to the Japanese as "Changkufeng Incident" and Russians as
the "Battle of Lake Khasan". This undeclared border war lasted from July 29 to August 11, 1938 with a ceasefire, but the contested frontier border line was never definitively resolved by the conflict or by either side.
Located to the east of Lake Khasan (Hasan) with 158m elevation, overlooking the Tumen River and Lake Khasan.
Located to the south of Changkufeng. During 1938, a road connects to the northward connecting Shachaofeng and Yankuanping (inside Manchuria). Occupied by Soviet troops, who shot a Japanese cavalryman during July 1938, triggering the Changkufeng Incident.
Located to the north of Changkufeng
Japanese Studies on Manchuria: Volume XI Part 1, page 27
The Anatomy of a Small War: The Soviet-Japanese Struggle for Changkufeng/Khasan, 1938 by Alvin D. Coox
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August 9, 2020