Based on the Shivagrha inscription, a public drinking water undertaking to change the course of the river around Shivagrha temple was carried out during the construction from the temple. The river, identified because the Opak River, now operates north to south on the western side of the Prambanan temple compound. https://www.diigo.com/item/note/b3og4/5nwt?k=9f8d545d10c5ce8c777ca745e33db774