East Java Rock Climbing

Java is an island of Indonesia. With a population of over 141 million (the island itself) or 145 million (the administrative region) as of 2015 Census released in December 2015, Java is home to 56.7 percent of the Indonesian population and is the most populous island on Earth. The Indonesian capital city, Jakarta, is located on western Java. The island is administratively divided into two special regions: Jakarta and Yogyakarta and four provinces: Banten, West Java, Central Java, East Java.

Formed mostly as the result of volcanic eruptions, Java is the 13th largest island in the world and the fifth largest in Indonesia. A chain of volcanic mountains forms an east–west spine along the island. Three main languages are spoken on the island: Javanese, Sundanese, and Madurese. Of these, Javanese is the dominant; it is the native language of about 60 million people in Indonesia, most of whom live on Java. Furthermore, most residents are bilingual, speaking Indonesian (the official language of Indonesia) as their first or second language. Java is divided into four provinces, West Java, Central Java, East Java, and Banten, and two special regions, Jakarta and Yogyakarta.

Java is almost entirely of volcanic origin; it contains thirty-eight mountains forming an east–west spine that have at once or another time been active volcanoes. The highest volcano in Java is Mount Semeru (3,676 m). The most active volcano in Java and also in Indonesia is Mount Merapi (2,930 m). The area of Java is approximately 150,000 km2. It is about 1,000 km (620 mi) long and up to 210 km (130 mi) wide. The island's longest river is the 600 km long Solo River. The river rises from its source in central Java at the Lawu volcano, then flows north and eastward to its mouth in the Java Sea near the city of Surabaya. Other major rivers are Brantas, Citarum, Cimanuk and Serayu.

The average temperature ranges from 22 °C to 29 °C; average humidity is 75%. The northern coastal plains are normally hotter, averaging 34 °C during the day in the dry season. The south coast is generally cooler than the north, and highland areas inland are even cooler.[13] The wet season begins in November and ends in April. During that rain falls mostly in the afternoons and intermittently during other parts of the year. The wettest months are January and February.

For full reference: en.wikipedia.org/wiki/Java