Blackwater River State Park is considered one of the purest sand bottom rivers in the world, the Blackwater River is in its natural state for almost its entire length. The parts that we have been on is shallow and great for kayaking and canoeing. Great place to bring the kids, there a lot of sandy spots to stop and swim. Beginning 45 miles upstream in Alabama, it continues downstream for 13 miles before emptying into Blackwater Bay. The river’s sand bottom, dark tannin waters and contrasting large, white sandbars have drawn worldwide attention and provide the perfect setting for this 590- acre state park.