Disney's River Country was the first water park at Walt Disney World. It opened on June 20, 1976 and ceased operations on November 2, 2001. On January 20, 2005, The Walt Disney Company announced that River Country would remain closed permanently. Along with Discovery Island, it is one of only two Disney parks in history to close permanently. Both parks were abandoned rather than demolished.
Here are some "then & now" photos of Disney's River Country...
River Country featured a rustic wilderness theming, complete with rocks and man-made boulders. It was described as an "old-fashioned swimming hole" with "a twist of Huckleberry Finn".
Various videos of River Country Then and Now
* More information and images of Disney's Abandoned River Country Here