The ARAL River, with four letters in the crossword, is a river in Central Asia that flows into the ARAL Sea. The Ural River, also with four letters in the crossword, is a river in Russia and Kazakhstan that flows into the Caspian Sea. The Amu Darya River, with three letters in the crossword, is a river in Central Asia that flows into the ARAL Sea. It is the longest river in Asia and is also known as the Asia's Oxus River.