That is the strait between Sakhalin and Hokkaido known as La Perouse Strait Here is mine. 1) First Train Arrived here on 22 May 1869 2) Captured on 24 October 1941 3) A tank was designed here.
Navy and Army personnel were stationed here against U-boat attacks or invasion. Casualties occurred here.
OK. Here's a few clues: 1. Napalm was first used here 2. Two US Navy ships were sunk here 3. A small male child and an obese man stayed here before becoming well known