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
Lake Okeechobee one point near the center of the lake. The name "Okeechobee" comes from the Hitchiti words "oki" (water) and "chubi" (big). Mayaimi, meaning "big water," is the oldest known name, as reported in the 16th century, by Hernando de Escalante Fontaneda. Slightly later in the 16th century René Goulaine de Laudonnière reported hearing about a large freshwater lake in southern Florida called "Serrope". By the 18th century the largely mythical lake was known to British mapmakers and chroniclers by the Spanish name "Laguna de Espiritu Santo." In the early 19th century it was known as "Mayacco Lake" or "Lake Mayaca"