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
Florida Heartland Series race usually held in the second week of March, drew a "paying crowd" of more than 169,000 in 2006. Many seasonal residents live in the area during the winter months only, as temperatures in south Florida stay very moderate during that time of year. Lake Okeechobee and Lake Istokpoga attract fishers to the area. Area code 863 is used throughout the region. There are two daily newspapers published in the Heartland, the "Okeechobee News" (Okeechobee), and "Highlands Today" (Sebring). Other daily newspapers that serve the Heartland include: There are no local television stations in the Florida Heartland. TV service