9th century Hindu temple of Prambanan in the Mataram kingdom of Medang

The magnificent 9th century Hindu temple of Prambanan , Yogyakarta , was a major Hindu monument in the Mataram kingdom of Medang.
THIS TEMPLE IS UNIQUE BECAUSE IT RECORDS DIVERSION OF RIVER FOR BUILDING TEMPLE COMPLEX.
A temple was first built at the site around 850 CE by Rakai Pikatan. According to Shivagrhat inscription, a public water project to change the course of a river near Shivagrha Temple was conducted during the construction of the temple. The river, identified as the Opak River, now runs north to south on the western side of the Prambanan temple compound. Historians suggest that originally the river was curved further to east and was deemed too near to the main temple. The project was done by cutting the river along a north to south axis along the outer wall of the Shivagrha Temple compound. The former river course was filled in and made level to create a wider space for the temple expansion, the space for rows of pervara (complementary) temples.