Nagaki are enclosures made of rocks that enable fish to be caught using the sea's tides. At high tide, when the nagaki is under water, fish move inside; when the tide goes out and the sea level drops below the walls, the fish are trapped and easily caught.

This fishing method is practiced not only in Okinawa and Kyushu, but in Polynesia and in parts of Southeast Asia. In Okinawa, the nagaki is famous for its use especially along the Sawada coast of Irabu Island and the south coast of Kohama Island.

The nagaki in Kohama are up to 12m wide by 1200m long, making them the biggest in the world. It is said that in old times, nagaki were first built for a lady born in Kohama who served in the court of the Ryukyu King.

Ovet the centuries, most nagaki have collapsed, but some are still used. Nagaki is a way of fishing that lets you feel a sense of fun.