Based On the Shivagrha inscription, a public drinking water project to alter the course of a river around Shivagrha temple was carried out through the construction with the temple. The river, determined as the Opak River, now runs north to south over the western side of your Prambanan temple compound. https://adelaidepopularhindutemple.blogspot.com/2024/09/hanuman-mandir-south-australia-hindu.html