There are lakes at the bottom of the ocean.

Extra-salty water is so dense that it pools beneath ordinary seawater, creating a distinct surface and shoreline.

Some even have waves. A lake inside the sea, with water above its water.

There are lakes at the bottom of the ocean

An underwater brine lake with a distinct rim on the Gulf of Mexico seafloor

An underwater brine lake with a distinct rim on the Gulf of Mexico seafloor — Ocean Exploration Trust / Nautilus Live

The boundary and surrounding seafloor of a Gulf of Mexico brine pool

The boundary and surrounding seafloor of a Gulf of Mexico brine pool — Ocean Exploration Trust / Nautilus Live

Cross-section showing dense brine collecting in a seafloor depression

There are lakes at the bottom of the ocean

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