01 / Teuri Island
Seabirds breed on the western cliffs,and people live in the east.

Teuri Island has a circumference of 12 km. Its west side is a sheer cliff and its east side is flat, where people live. The seabird breeding ground is a national natural monument, and the Hokkaido Regional Forest Office presents it as the only breeding site in Japan of the Common Murre, known as the Ororon bird.
- National natural monument since 1938, per the Agency for Cultural Affairs
- Rhinoceros auklets dig burrows underground, per its commentary
- Island circumference: 12 km

