 Running from east to west toward its own mouth in the southern tip of Randolph County, the Black receives the Current River and Fourche River east of Pocahontas.The Current River serves as the northeastern county boundary with Clay County before turning southwest, passing Reyno and Biggers and meeting the Black east of Pocahontas.The Fourche River enters Randolph County near Doniphan, Missouri and runs south to meet the Black east of Pocahontas.