Based On the Shivagrha inscription, a general public water task to alter the course of a river around Shivagrha temple was carried out during the development in the temple. The river, identified since the Opak River, now runs north to south around the western facet in the Prambanan temple compound. https://hindutemplesinadelaide.finance.blog/2024/09/29/hanuman-mandir-south-australia-a-spiritual-and-cultural-hub/