Big Cypress National Preserve has vast expanses of scenic vistas with marshes, sloughs, strands, hammocks, and pine forests. Water is its life's blood. It flows at the whim of geology and human interference. Because the land is nearly flat, the water flows slowy on its way to the Gulf of Mexico. On its way there it encounters roads, canals, and water control devices. If it has flowed into the Preserve from points north, it probably has agricultural runoff in it. Management's biggest challenge now is to assure its availability into the future.