Surrounding the Yamato Bank (approximately 400 meters in water depth), there are 3 major deep basins: the Japan Basin (approximately 3,000 meters in water depth) on the north, the Yamato Basin on the southwest and the Tsushima Basin on the southeast (approximately 2,500 meters in water depth, respectively).
中央の大和堆（水深約400m）を挟んで主に3つの深い海盆があり北に日本海盆（水深およそ3,000m）、南西にやや浅い大和海盆、南東に対馬海盆（ともに水深およそ2500m）と呼ばれている。