01 / Tooriike Ponds
Two ponds linked to the sea:their depth shifts with the tide.

Two ponds on Shimoji Island are joined by a natural bridge. The northeastern one is about 55 m across and the southwestern about 75 m, and an undersea cave about 10 m wide links them to the sea, so their depth changes with the tide. They are thought to have formed when two points in a limestone cave collapsed.
- Northeastern pond: about 55 m across, about 25 m deep
- Southwestern pond: about 75 m across, about 40 m deep on the sea side
- Linked to the sea by a cave about 10 m wide
- 2006: national Place of Scenic Beauty and Natural Monument
