Lake Iamonia ⟨aɪ ˈmoʊ njə⟩ is a large, subtropical prairie lake in northern Leon County, Florida, United States, created during the Pleistocene epoch. Lake Iamonia's base was established during the Early Pleistocene through submergence of land during the various glacial retreats and emergence from the sea during glacial stadial advancement. Though …Lake Iamonia ⟨aɪ ˈmoʊ njə⟩ is a large, subtropical prairie lake in northern Leon County, Florida, United States, created during the Pleistocene epoch. Lake Iamonia's base was established during the Early Pleistocene through submergence of land during the various glacial retreats and emergence from the sea during glacial stadial advancement. Though the ice sheet was further north, it affected Iamonia's appearance and significant changes began to take shape during the Okefenokee terrace and shoreline period and was complete by the end of the Wicomico terrace and shoreline event thousands of years later.