Uet era Ongael is connected to the ocean through fissures and tunnels in the limestone of ancient Miocene reefs.

papua remengesaui[1] is substantially different from their close relatives living in the nearby lagoons.

The small lake is also home to jellyfish of other species (Aurelia sp., Cassiopea sp.).

Uet era Ongael is the smallest and shallowest Palau lake with registered endemic subspecies of jellyfish.

The lake is holomictic - it does not have layers as it is comparatively shallow and with low banks, permitting for winds and sea tides to mix the water.