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 Waterway the lake. A downloadable map of the Okeechobee Waterway can be found by clicking here. Geologically and geographically, the north bank of the canal is the official southern limit of the Eastern Continental Divide. It was built/finished in 1937 to provide a water route across Florida, allowing boats to pass east–west across the state rather than traveling the long route around the southern end of the state. Lake Okeechobee and the Okeechobee Waterway Project is part of the complex water-management system known as the Central and Southern Florida Flood Control Project. The projects cover 16,000 square miles starting just south