The Florida Trail in South Florida passes through some of the wildest terrain in the Eastern United States on its journey north through the Big Cypress National Preserve. This is a wet wilderness, seasonally flooded when summer rains flow in shallow sheets through the River of Grass to the Gulf of Mexico. Next comes the Seminole Section, a walk through Big Cypress Seminole Reservation and upon the dikes of the South Florida Water Management District through agricultural lands carved out of the Everglades a century ago. The trail splits in two to surround Lake Okeechobee, Florida's largest lake and the second largest lake entirely inside the United States, and heads northward along the Kissimmee River, the largest water source for Lake Okeechobee.