It is located to the south-east of Jindo Island and is about 1.1 km (0.68 mi) long and 300 m (980 ft) wide.

The tide-related sea level variations result in a land pass 2.9 km (1.8 mi) long and 10–40 meters wide opening for approximately an hour between Modo and Jindo islands.

[1] It had long been celebrated in a local festival called "Jindo's Sea Way", but was largely unknown to the world until 1975, when the French ambassador Pierre Randi described the phenomenon in a French newspaper.

[2][3] Nowadays, nearly half a million foreign and local tourists attend the event annually.

It is accompanied by local festivals which include Ganggangsuwollae (Korean traditional circle dance), Ssitkim-gut (a shaman ritual, consoling the souls of the dead), Deul Norae (traditional farmers' songs), Manga (burial ceremony songs), Jindo dog show, Buknori (drum performance) and fireworks.