The Sea of Japan is connected to the Okhotsk Sea through the Mamiya Strait (the Tatar Strait) between the continent and Sakhalin as well as through the Soya Strait between Sakhalin and Hokkaido.
大陸と樺太の間の間宮海峡（タタール海峡）、樺太と北海道の間の宗谷海峡でオホーツク海と繋がっている。