Opak River is a river in central south area of

Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...

island, Indonesia.

Hydrology

It flows from its source on the slopes of

Mount Merapi Mount Merapi, ''Gunung Merapi'' (literally Fire Mountain in Indonesian and Javanese), is an active stratovolcano located on the border between the province of Central Java and the Special Region of Yogyakarta, Indonesia. It is the most active ...

in the north, heading southward and passes the west side of 9th-century

Prambanan Prambanan ( id, Candi Prambanan, jv, ꦫꦫꦗꦺꦴꦁꦒꦿꦁ, Rara Jonggrang) is a 9th-century Hindu temple compound in Special Region of Yogyakarta, Indonesia, dedicated to the Trimūrti, the expression of God as the Creator (Brahma), the P ...

temple compound, located to the east of

Yogyakarta Yogyakarta (; jv, ꦔꦪꦺꦴꦒꦾꦏꦂꦠ ; pey, Jogjakarta) is the capital city of Special Region of Yogyakarta in Indonesia, in the south-central part of the island of Java. As the only Indonesian royal city still ruled by a monarchy, ...

and west of

Kota Gede Kotagede (Javanese: ꦏꦸꦛꦒꦼꦝꦺ ''Kuthagedhé'') is a city district (''kemantren'') and a historic neighborhood in Yogyakarta, Special Region of Yogyakarta, Indonesia. Kotagede contains the remains of the first capital of Mataram Sultanat ...

. It also passes the historical locations of

Plered Plered (also Pleret) was the location of the palace of Amangkurat I of Mataram (1645–1677). Amangkurat moved the capital there from the nearby Karta in 1647. During the Trunajaya rebellion, the capital was occupied and sacked by the rebels, an ...

, Karta, and

Imogiri Imogiri (ꦲꦶꦩꦒꦶꦫꦶ in Javanese script or ''Imagiri'' in standard Javanese spelling) is a royal graveyard complex in Yogyakarta, in south-central Java, Indonesia, as well as a subdistrict under the administration of Bantul Regency. Im ...

before draining into the

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by th ...

in the southern part of

Bantul Bantul is a town and district, and the capital of Bantul Regency, Special Region of Yogyakarta, Indonesia. The district (''kapanewon'') covers an area of and had a population of 64,360 at the 2020 Census. It is a bustling town about to the sout ...

. The river runs upon Opak tectonic fault, a major tectonic fault in southern Central Java responsible for major earthquakes in the region.. The river basin that it lies in is significant as the aquifer is in a heavily populated part of Java One of the tributaries is

Oyo River The Oyo River is a river in southern Central Java and Yogyakarta, in the central south area of Java island, Indonesia.Kali Oyo ...

Geography

The river flows in the southwest area of Java with predominantly

tropical monsoon climate An area of tropical monsoon climate (occasionally known as a sub-equatorial, tropical wet climate or a tropical monsoon and trade-wind littoral climate) is a tropical climate sub-type that corresponds to the Köppen climate classification category ...

(designated as ''Am'' in the Köppen-Geiger climate classification). The annual average temperature in the area is 22 °C. The warmest month is October, when the average temperature is around 26 °C, and the coldest is January, at 18 °C. The average annual rainfall is 2970 mm. The wettest month is January, with an average of 537 mm rainfall, and the driest is September, with 22 mm rainfall.

Gallery

File:View on the Opak-river. S.M. Java) KITLV 1404178.tiff, View on the Opak River. S.M. Java. file:KITLV 91017 - Kassian Céphas - Crossing by proa from the Kali Opak at Kretek near Yogyakarta - 1897-04-19.tif, A boat crossing the Opak River. file:Opak ten zuiden van Jogjakarta KITLV 151169.tiff, Opak River's bank.

References

External links

* http://www.thejakartapost.com/news/2009/02/16/three-die-floods-landslide-yogyakarta.html

Hydrology

Geography

Gallery

See also

References

External links

Further reading