A country in the Middle East, east of the Jordan River; population 6,269,300 (est. 2009); capital, Amman; official language, Arabic. A river that flows south for 200 miles (320 km) from the Anti-Lebanon Mountains through the Sea of Galilee into the Dead Sea. John the Baptist baptized Jesus Christ in the Jordan River. It is regarded as sacred not only by Christians but also by Jews and Muslims.