This is a small version of the uchiumi cha-irie, with a wide mouth. The “Ben 0:0 Gyokushu” says “大海” means wide and the mouth is wide and the word is used as a metaphor for the sea, and the capital letter on the ocean is written as “内海”, and the small one is called uchiumi, this theory is wrong, the small one is called kouchiumi, this is the main theory, but the word “大海内海” has been spread all over the world. However, if this is true, it is not so, and the small is called the small inland sea.
