What is the zone of a lake where no light reaches?

The zone of a lake where no light reaches is called the benthic zone or hypolimnion, depending on the context. In this area, typically found at greater depths, there is a complete absence of sunlight, which limits photosynthesis. As a result, the ecosystem is primarily supported by decomposers and organisms that can thrive in dark, cold environments. The lack of light also affects the types of organisms that can live there, leading to unique adaptations among the species that inhabit this zone.