Here's a quickie waterfall video I shot at the Rock Island State Park in Rock Island, Tennessee. Twin Falls flows from underground caverns in the mountain into the Caney Fork river. This part of the river is a very popular place for kayakers wanting to challenge the river's large waves and rapids. An interesting note is that the source of the falls is actually seepage from Great Falls lake on the other side of the mountain and seeps through underground caverns connecting the two sides of the mountain.