The deepest zone in a large lake, below where the sunlight penetrates, is the:

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The deepest zone in a large lake, below where the sunlight penetrates, is called the profundal zone. The limnetic zone is the open, well-lit surface water layer of a lake, and the littoral zone is the shallow, near-shore area that is still penetrated by sunlight. The benthic zone refers to the sediment and bottom-dwelling organisms. The intertidal zone is the area between high and low tide in coastal zones.

The Deepest Zone in a Large Lake, Below Where the Sunlight