Word Categories

Ohio River O Oise O Okavango O Orange O Orinoco O Oti O Ottawa O Ottawa River O Pamlico P Paraguay P Paraná P Paranaiba P Parnaíba P Pasig P Peace P Pearl P Pechora P Pecos P Pilcomayo P Platte P Po P Purus P Quinebaug Q Red R Red River R Red River of the North R Republican R Republican River North Fork R Restigouche R Rhine R Rhine-Main-Danube Canal R Rhone R Rio de la Plata R Rio Grande R Rio Roosevelt R Roanoke R Ruhr R Saale S Sabine S Saguenay S Salado S Salado (Argentina) S Salween S San Joaquin S Santee S Sao Francisco S Saskatchewan S Sava S Scheldt S Seine S