Asō Bay (浅茅湾, Asō-wan) is a large, complex inlet that nearly cleaves in two the Japanese island of Tsushima.

The bay is notable for its ria coastline, with many peninsulas and various small islands found in close proximity to the shore.

[1] It forms part of the Iki-Tsushima Quasi-National Park.

[2] Pearls are cultured and Japanese amberjack are farmed in its waters.

The channel was cut by the Imperial Japanese Navy between 1895 and 1904.