Dracozu River is a location found in Breath of the Wild.
Breath of the Wild
There are a pair of treasure chests found in the water. The first is near the start of the river, just east of the Bokoblin stronghold. The treasure chest is underwater and contains a Purple Rupee. Another treasure chest that contains a purple rupee can be found further along the river, closer to the Dracozu Lake.
Nearby Korok Seeds
Pick up the rock.