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Nerodia floridana
Black non-poisonous snake with a fairly uniform round head. Light to creamy belly and chin and the scales on the back have keels the sides do not. It has dark round eyes. The third picture was modified to accentuate the keeled scales.
Swampy prairie. Spotted at Sweetwater Wetlands Park. The park is in Gainesville, FL within Payne's Prairie. The whole park is waterlogged and navigable via loose gravel, unpaved dikes and boardwalks.
I have spotted banded watersnakes in the same location of the park in the past.