ANSWER: Java
Explanation:
The greatest monument of Indo-Java art is the Borobudur which was built during A.D. 750-850 under the patronage of the Sailendras. It is situated on the top of a hill. It consists of nine successive terraces, crowned by a bell-shaped stupa at the centre of the topmost terrace. Borobudur is described as an epic in stone, the most wonderful Buddhist stupa in the world.