A Watershed is an area of land around a body of water like a river or lake that collects water from the surrounding land. The water within that basin flows across land and through streams and rivers until it reaches it’s common destination. The Caloosahatchee River extends from Lake Okeechobee in the center of the state to the Gulf of Mexico. The land north and south of the river sends water into the river as the land becomes saturated with rainfall. Streams and tributaries also feed into the river making it swell with more water. Another common watershed in SW Florida is the Charlotte Harbor Watershed which has a land area of about 4.700 square miles and consists of land in seven counties of SW Florida. Large Rivers which feed the Charlotte Harbor Watershed are the Myakka, and Peace Rivers. Over 1.3 million people live within the Charlotte Harbor Watershed and depend on its water for drinking water and protection of wildlife. The Southwest Florida Water Management District has a task to keep the water in the watershed around SW Florida clean and to provide flood control. They have a good illustration of a watershed at their website.