Island in Indonesia
Java is one of the islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 153.8 million people, Java is the world's most populous island, home to approximately 54% of the Indonesian population. Indonesia's capital city, Jakarta, is on Java's northwestern coast.
Many of the best known events in Indonesian history took place on Java. It was the centre of powerful Hindu-Buddhist empires, the Islamic sultanates, and the core of the colonial Dutch East Indies. Java was also the center of the Indonesian struggle for independence during the 1930s and 1940s. Java dominates Indonesia politically, economically and culturally. Four of Indonesia's eight UNESCO world heritage sites are located in Java: Ujung Kulon National Park, Borobudur Temple, Prambanan Temple, and Sangiran Early Man Site.
Java was formed by volcanic eruptions due to geologic subduction of the Australian Plate under the Sunda Plate. It is the 13th largest island in the world and the fifth largest in Indonesia by landmass, at about (including Madura's ). A chain of volcanic mountains is the east–west spine of the island.
Four main languages are spoken on the island: Javanese, Sundanese, Madurese, and Betawi. Javanese and Sundanese are the most spoken. The ethnic groups native to the island are the Javanese in the central and eastern parts and Sundanese in the western parts. The Madurese in the Eastern salient of Java are migrants from Madura Island, while the Betawi in the capital city of Jakarta are hybrids from various ethnic groups in Indonesia. Most residents are bilingual, speaking Indonesian (the official language of Indonesia) as their first or second language. While the majority of the people of Java are Muslim, Java's population comprises people of diverse religious beliefs, ethnicities, and cultures.
Java is divided into four administrative provinces: Banten, West Java, Central Java, and East Java, and two special regions, Jakarta and Yogyakarta.
Etymology.
The origins of the name "Java" are not clear. The island could possibly have been named after the "jáwa-wut" plant, which was said to be common in the island during the time, and that prior to Indianization the island had different names. There are other possible sources: the word "jaú" and its variations mean "beyond" or "distant". And, in Sanskrit "yava" means barley, a plant for which the island was famous. "Yavadvipa" is mentioned in India's earliest epic, the Ramayana. Sugriva, the chief of Rama's army, dispatched his men to Yavadvipa, the island of Java, in search of Sita. It was hence referred to in India by the Sanskrit name "yāvaka dvīpa" (dvīpa = island). Java is mentioned in the ancient Tamil text "Manimekalai" by Chithalai Chathanar which states that Java had a kingdom with a capital called Nagapuram. Another source states that the word "Java" is derived from a Proto-Austronesian root word, meaning "home". The great island of Iabadiu or Jabadiu was mentioned in Ptolemy's "Geographia" composed around 150 CE in the Roman Empire. "Iabadiu" is said to mean "barley island", to be rich in gold, and have a silver town called Argyra at the west end. The name indicates Java and seems to be derived from the Sanskrit name Java-dvipa (Yavadvipa).
The annual news of Songshu and Liangshu (5th century CE) referred to Java as 闍婆 ("She-pó" or "She-bó"), He-ling (640–818), then called it She-po again until the Yuan dynasty (1271–1368), where they began mentioning 爪哇 ("Zhao-Wa" or "Chao-Wa"). According to Ma Huan's book (the Yingya Shenlan), the Chinese called Java Chao-Wa, and the island was called She-po in the past. Sulaiman al-Tajir al-Sirafi mentioned two notable islands which separated Arabia and China: One is the 800 farsakh long Al-Rami, which is identified as Sumatra, and the other is Zabaj (Arabic: الزابج, Indonesian: Sabak), 400 farsakh in length, identified as Java. When John of Marignolli returned from China to Avignon, he stayed at the Kingdom of Saba for a few months, which he said had many elephants and was led by a queen; Saba may be his interpretation of She-bó."xii, 192–194" Afanasij Nikitin, a merchant from Tver (in Russia), traveled to India in 1466 and described the land of java, which he called шабайте (shabait/šabajte).
Geography.
Java lies between Sumatra to the west and Bali to the east. Borneo lies to the north, and Christmas Island is to the south. It is the world's 13th largest island. Java is surrounded by the Java Sea to the north, the Sunda Strait to the west, the Indian Ocean to the south and Bali Strait and Madura Strait in the east.
Java is almost entirely of volcanic origin; it contains 38 mountains forming an east–west spine that have at one time or another been active volcanoes. There are 112 volcanoes in all, 35 of which are active. The highest volcano in Java is Mount Semeru, . The most active volcano in Java and also in Indonesia is Mount Merapi, . In total, Java has more than 150 mountains.
Java's mountains and highlands split the interior into a series of relatively isolated regions suitable for wet-rice cultivation; the rice lands of Java are among the richest in the world. Java was the first place where Indonesian coffee was grown, starting in 1699. Today, coffea arabica is grown on the Ijen Plateau by small-holders and larger plantations. 
The area of Java is about (including Madura's and minor offshore islands). It is about long and up to 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 to ; average humidity is 75%. The northern coastal plains are normally hotter, averaging during the day in the dry season. The south coast is generally cooler than the north, and highland areas inland are even cooler. 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.
West Java is wetter than East Java, and mountainous regions receive much higher rainfall. The Parahyangan highlands of West Java receive over annually, while the north coast of East Java receives annually.
Natural environment.
Java is an island with a large amount of biodiversity. The natural environment of Java is tropical rainforest, with ecosystems ranging from coastal mangrove forest on the north coast, rocky coastal cliffs on the southern coast, and low-lying tropical forest to high altitude rainforest on the slopes of mountainous volcanic regions in the interior. The Javan environment and climate gradually alters from west to east; from wet and humid dense rainforest in western parts, to a dry savanna environment in the east, corresponding to the climate and rainfall in these regions.
Javan wildlife originally supported a rich biodiversity, where numbers of endemic species of flora and fauna flourished; such as the Javan rhinoceros, Javan banteng, Javan warty pig, Javan hawk-eagle, Javan peafowl, Javan silvery gibbon, Javan lutung, Java mouse-deer, Javan rusa, and Javan leopard. With over 450 bird species and 37 endemic species, Java is a birdwatcher's paradise. There are about 130 freshwater fish species in Java. There are also several endemic amphibian species in Java, including 5 species of tree frogs.
Since ancient times, people have opened the rainforest, altered the ecosystem, shaped the landscapes and created rice paddy and terraces to support the growing population. Javan rice terraces have existed for more than a millennium and had supported ancient agricultural kingdoms. The growing human population has put severe pressure on Java's wildlife, as rainforests were diminished and confined to highland slopes or isolated peninsulas. Some of Java's endemic species are now critically endangered, with some already extinct; Java used to have Javan tigers and Javan elephants, but both have been rendered extinct. Today, several national parks exist in Java that protect the remnants of its fragile wildlife, such as Ujung Kulon, Mount Halimun-Salak, Gede Pangrango, Baluran, Meru Betiri, Bromo Tengger Semeru and Alas Purwo.
History.
"Homo erectus" presence.
Fossilised remains of "Homo erectus", popularly known as the "Java Man", dating back 1.3 million years were found along the banks of the Bengawan Solo River.
"H. erectus" arrived in Eurasia approximately 1.8 million years ago, in an event considered to be the first African exodus. There is evidence that the Java population of "H. erectus" lived in an ever-wet forest habitat. More specifically the environment resembled a savannah, but was likely regularly inundated ("hydromorphic savanna"). The plants found at the Trinil excavation site included grass (Poaceae), ferns, "Ficus", and "Indigofera", which are typical of lowland rainforest.
"H. e. soloensis" was the last population of a long occupation history of the island of Java by "H. erectus", beginning 1.51 to 0.93 million years ago at the Sangiran site, continuing 540 to 430 thousand years ago at the Trinil site, and finally 117 to 108 thousand years ago at Ngandong. If the date is correct for Solo Man, then they would represent a terminal population of "H. erectus" which sheltered in the last open-habitat refuges of East Asia before the rainforest takeover. Before the immigration of modern humans, Late Pleistocene Southeast Asia was also home to "H. floresiensis" endemic to the island of Flores, Indonesia, and "H. luzonensis" endemic to the island of Luzon, the Philippines. Genetic analysis of present-day Southeast Asian populations indicates the widespread dispersal of the Denisovans (a species currently recognisable only by their genetic signature) across Southeast Asia, whereupon they interbred with immigrating modern humans 45.7 and 29.8 thousand years ago. A 2021 genomic study indicates that, aside from the Denisovans, modern humans never interbred with any of these endemic human species, unless the offspring were unviable or the hybrid lineages have since died out.
Judging by the sheer number of specimens deposited at Ngandong at the same time, there may have been a sizeable population of "H. e soloensis" before the volcanic eruption which resulted in their interment, but population is difficult to approximate with certainty. This site is quite far from the north coast of Java Island, and it is not always easy to determine the position of the coastline in prehistoric times because of significant geographical changes.
The southern coastline and estuary of the Bengawan Solo River at that time may have been different from what it is today, due to geological factors such as sedimentation, erosion, and changes in sea level over time. Currently, the estuary of the Bengawan Solo is in the Java Sea, but in prehistoric times, the river flow and estuary location may have changed. Geological and paleogeographic studies are often used to understand these changes.
After the arrival of modern humans.
The island's exceptional fertility and rainfall allowed the development of wet-field rice cultivation, which required sophisticated levels of cooperation between villages. Out of these village alliances, small kingdoms developed. The chain of volcanic mountains and associated highlands running the length of Java kept its interior regions and peoples separate and relatively isolated. Before the advent of Islamic states and European colonialism, the rivers provided the main means of communication, although Java's many rivers are mostly short. Only the Brantas river and Solo river could provide long-distance communication and this way their valleys supported the centers of major kingdoms. A system of roads, permanent bridges, and toll gates is thought to have been established in Java by at least the mid-17th century. Local powers could disrupt the routes as could the wet season and road use was highly dependent on constant maintenance. Consequently, communication between Java's population was difficult.
The emergence of civilization on the island of Java is often associated with the arrival of Aji Saka in 78 AD. Although Aji Saka is said to be the bearer of civilization on Java, the story received several objections and rebuttals from other historical sources. Valmiki's Ramayana, made around 500 BC, records that Java already had a governmental organization long before the story:"Yawadwipa is decorated with seven kingdoms, gold and silver islands, rich in gold mines, and there is Cicira (cold) Mountain that touches the sky with its peak."6
The Greek geographer Ptolemy called the island Iabadius or Sabadius (). Ptolemy said that the name meant the "Island of Barley" and produced a lot of grain and gold, adding that its metropolis was Argyre (Ἀργυρῆ) meaning silver in Greek.
According to