According To the Shivagrha inscription, a general public h2o project to change the program of a river near Shivagrha temple was undertaken for the duration of the construction on the temple. The river, determined since the Opak River, now runs north to south about the western side in the Prambanan https://hindutempleinadelaide.wordpress.com/2024/09/29/the-hanuman-mandir-spiritual-and-cultural-center-for-the-hindu/