According to the Shivagrha inscription, a public water venture to alter the course of the river near Shivagrha temple was carried out during the construction on the temple. The river, determined as being the Opak River, now runs north to south on the western facet on the Prambanan temple compound. https://hanumantempleadelaide.fashion.blog/2024/09/29/hanuman-mandir-south-australia-a-premier-hindu-temple-in-adelaide/