Major Landforms and Bodies of Water in Japan

Tsugaru Strait!(津軽海峡!)

The Tsugaru Strait is between the islands Hokkaido and Honshu. The Saiken Tunnel goes through it at it's narrowest point. The strait is considered a major zoo-geographical boundary. It is considered this because the animals on Hokkaido are most like the animals in northern Asia and the animals on Honshu are most like the animals of southern Asia.