Based On the Shivagrha inscription, a general public water undertaking to alter the study course of the river around Shivagrha temple was undertaken during the construction of your temple. The river, discovered as the Opak River, now operates north to south over the western aspect on the Prambanan temple compound. https://medium.com/@HinduTempleAdelaide/discovering-spiritual-sanctuaries-hanuman-ji-mandir-in-adelaide-d56457ab67e4