Lake Okeechobee Valley and the Everglades. The trough is underlain by clay deposits that compacted more than the limestone and sand deposits did along both coasts of peninsular Florida. Until about 6,000 years ago, the trough was dry land. As the sea level rose, the water table in Florida also rose and rainfall increased. From 6,000 to 4,000 years ago, wetlands formed building up peat deposits. Eventually the water flow into the area created a lake, drowning the wetlands. Along what is now the southern edge of the lake, the wetlands built up the layers of peat rapidly enough (reaching thick) to
Okeechobee County, Florida and (13.8%) is water. The Lake Okeechobee Scenic Trail, part of the Florida National Scenic Trail, runs along the Herbert Hoover Dike around the Lake. As of the census of 2010, there were 39,996 people, 13,857 households, and 9,016 families residing in the county. The population density was 46 people per square mile (18/km²). There were 15,504 housing units at an average density of 52 per square mile (8/km²). The racial makeup of the county was 87.9% White, 8.6% Black or African American, 1.3% Native American, 0.9% Asian, 0.1% Pacific Islander, and 1.2% from two or more races. 24.5% of