The M/s Senopati Nusantara was an Indonesian ferry that sank in a storm on December 30, 2006. The Japanese-made ship (built in 1969) was a scheduled passenger liner from the port of Kumai in Central Kalimantan (Borneo) to Tanjung Emas port in Semarang, East Java. About 40 km (25 mi) off Mandalika island, the ship sank during a violent storm in the Java Sea. At least 400–500 people are thought to have drowned.