A Borobudur ship is the 8th-century wooden double outrigger, sailed vessel of Maritime Southeast Asia depicted in some bas reliefs of the Borobudur Buddhist monument in Central Java, Indonesia. The ships depicted at Borobudur were most likely the type of vessels used for inter-insular trades and naval campaigns by the Sailendran and Srivijayan thalassocracy empire that ruled the region around the 7th to the 13th century. The function of the outrigger was to stabilize the ship; a single or double outrigger canoe is the typical feature of the seafaring Austronesian vessels. It is considered by scholars to have been the most likely type of vessel used for their voyages and exploration across Southeast Asia, Oceania, and the Indian Ocean.