Opak Usus

Opak River is a river in central south area of Java island, Indonesia. It flows from its source on the slopes of Mount Merapi in the north, heading southward and passes the west side of 9th-century Prambanan temple compound, located to the east of Yogyakarta and southeast of Kota Gede.
  • Country: Indonesia
  • State: Yogyakarta
  • Region: Bantul Regency, Sleman Regency
  • Source: Mount Merapi
  • Length: 65 km (40 mi)
  • Basin size: 638.89 km² (246.68 sq mi)
Data from: en.wikipedia.org