On the border of the US states of Texas and Louisiana stretches unique natural reserve - Caddo Lake. On its territory grow the largest cypress forests of our planet. Caddo - it is the only lake in Texas, which was formed naturally. In the early nineteenth century on the River Red River originated from congestion river debris and logs. Beavers living on the banks of the river, have strengthened this mash their dams. Thus was formed a dam that blocked the movement of the river, and was the beginning of the creation of the lake. Now this protected area with unique nature.