Moneron -

Thanks to the warm Tsushima Current, the turquoise waters are unusually transparent and temperate, supporting diverse marine life including ringed seals, largha seals, and large Steller sea lion rookeries.

Nevelsk District, Sakhalin Oblast, Russian Far East.

The southeastern coast hosts the region's largest seashore colony of birds.

Because the island is a protected nature park, access and stays are limited. Reviewers highlight the diligent work of the Moneron Park staff in conservation.

Visitors can explore emerald hills reaching heights of 493 meters, alpine meadows, rivers, waterfalls, and unique columnar cliffs.