The Bagnell Dam River is a tributary of the Osage River, which is five letters long. The Nile River is four letters long and is located in Africa. The GILA River is also four letters long and is located in the southwestern United States. The WEIR River is four letters long and is located in England. The Eder River is four letters long and is located in Germany. Lastly, the Shasta River is six letters long and is located in California.