There are about 70 other marine lakes located throughout the Rock Islands and Koror.

Clear Lake is connected to the ocean through fissures and tunnels in the limestone of ancient Miocene reef.

papua nakamurai[1] and possibly other species in the lake have evolved to be substantially different from their close relatives living in the nearby lagoons.

The oxygen concentration in the lake declines from about 6 mg/L at the surface to zero at 10 meters (at the chemocline).

[2] Stratification is persistent and seasonal mixing does not occur.