Temple mountain built by the Baphuon of Udayadityavarman II (reigned 1050-66 AD) in Angkor, Cambodia, unfortunately almost completely destroyed. It was a vast sandstone monument 480 yards (440 m) long and 140 yards (130 m) wide, approached by a 200-yard (180-m) causeway raised on pillars. Its ground plan shows a fully articulated structure and it was the immediate prototype for the great Angkor Wat. It was, at the time, the most massive artificial mountain of classical Cambodia and the second largest monument after Angkor Wat.