GEOGRAPHY
An Island Built by Volcanoes
Every aspect of Bali's geography and ecology is influenced by the towering range of volcanic peaks that dominate the island. They have created its landforms, periodically regenerated its soils,and helped to produce the dramatic downpours which provide the island with life-giving water. The Balinese recognize these geophysical facts of life, and the island's many volcanoes, lakes and springs are considered by them to be sacred.
Bali is continually being formed by volcanic action. The island lies over a major subduction zone where the Indo-Australian plate collides with the rigid Sunda plate with explosive results. A violent eruption of Mt. Agung (3,142 m before the eruption; 3,014 in now) in 1963 showered the mountain's upper slopes with ash and debris that slid off as mudflows, killing thousands of people and laying waste to irrigation networks and rice fields that had been built up over many years. Mt Batur (1,717 in) to the west is also active, with greater frequency but less violence.
A mild, equatorial climate
Lying between 8 and 9 degrees south of the equator, Bali has a short, hot wet season and a longer, cooler dry season. The mountains are wet year round, averaging 2,500 to 3,000 mm (100 to 120 inches) of rain annually, with warm days and cool nights. The lowlands are hotter and drier, but fresh and persistent winds make the climate less oppressive here than elsewhere in the equatorial zone.
The wet season lasts from November to March, and though there are only five or six hours of sunshine a day, this is also the hottest time of year (30-31" C by day, 24-25o C at night). The dry season is from April to October, when southeasterly winds blow up from the cool Australian interior (28-29o C by day, and a pleasant 23" C at night), with seven or eight hours of sunshine daily.
By itself, the rainfall in the lowlands is not enough for wet rice cultivation. In other parts of Indonesia, particularly Java, flood waters following heavy rains can be collected behind dams, but the steep, narrow valleys of Bali offer no good dam sites. Over the centuries, the Balinese have instead devised many sophisticated irrigation systems which optimize the water available from rain and rivers.
Bali's volcanic soils are in fact not naturally well-suited to wet rice cultivation. They are deep, finely textured and well-drained, so water soaks through them rapidly. While this reduces the risk of floods, it wastes precious water. Paradoxically, the solution is vigorous and repeated plugging, which actually renders the soils less permeable. Irrigated areas, moreover, receive a supply of nutrients from river water enriched by domestic effluents.
Man has extensively modified the natural vegetation of Bali. The moist primary forest which is its natural vegetation now covers only 1,010 sq km or 19 percent of Bali's total area, mainly in the western mountains and along the arc of volcanic peaks from Agung to Batukau. About a quarter of the forest is protected in four nature reserves, the largest of which is Bali Barat National Park (763 sq km. Further reserves are planned to protect another quarter of the island's forests.
An island of great contrasts
Bali may be small, but its physical geography is complex, creating an island of great contrasts. In simple outline, three major areas emerge - the mountains, the coastal lowlands and the limestone fringes. The mountains are lofty and spectacular, dominated by Mt Agung and its neighbors, Abang and Batur. Dramatic lava flows on the northeastern flanks of Agung are Bali's newest landforms, showing what the entire island probably looked like a million years ago.
The western mountains provide the last major wildlife sanctuary. Cultivation is here limited to coastal areas that are very dry in the north, but more prosperous and fertile in the south. Coconut groves, cattle pastures and rain fed fields line the foothills while rice fields are found along the coast. Unique canals vanish into foothill tunnels excavated as protection from landslides. In the extreme southwest, the new Palasari Dam forms the island's only manmade lake. On Bali's western tip, the coral reefs and clear waters around Menjangan Island provide fantastic scuba diving.
The southern lowlands formed the cradle of Balinese civilization. Here it is possible to grow two or more irrigated rice crops per year. Based on this agricultural surplus, eight small but powerful kingdoms arose, symmetrically lining the parallel north-south river valleys that shaped their early growth.
In contrast to the south, the north coast hosted only a single kingdom, centered on the less extensive but equally productive rice lands around Singaraja. Terracing here continues well into the hills, on slopes which elsewhere would be regarded as a severe erosion hazard. In Bali, these terraces stand as firm as masonry because of peculiar clay minerals within the soil. Further east, the dry coast is relieved by several major springs which emerge from fissures in the lava flows. The spring water is used for irrigating table grapes, a crop that thrives here.
The southern limestone fringes stand in complete contrast to the rest of Bali. These are dry and difficult to cultivate. The Bukit Peninsula south of the airport has impressive southern cliffs and many large caves. Across the sea to the east, Nusa Ceningan, Nusa Lembongan and Nusa Penida are dry limestone islands with scrubby vegetation and shallow soils. Villagers on Penida have built ingenious catchments to collect rainwater. Springs also emerge from the base of its high southern cliffs, and villagers scramble down precarious scaffolds to collect water. just as water is the measure of richness in the interior, so is it the measure of survival around the periphery. In Bali, water is truly sacred.

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Nature has endowed Bali with ideal conditions for the development of agriculture. The divine volcanoes, still frequently active, provide the soils with great fertility. Copious rainfall and numerous mountain springs supply many areas of the island with ample water year-round. And a long dry season, brought on by the southeasterly monsoon, brings plentiful sunshine for many months of the year. Bali is, as a result, one of the most productive traditional agricultural areas on earth, which has in turn made possible the development of a highly intricate civilization on the island since very early times.
One often gets the impression that nothing but wet-rice is grown on Bali, because of the unobstructed vistas offered by extensive irrigated rice fields between villages. This is not so. Out of a total of 563,286 hectares of arable land on Bali, just 108,200 hectares or about 19 percent is irrigated rice fields (sawah). Another 157,209 hectares are non-irrigated dry fields (tegalan) producing one rain-fed crop per year. A further 134,419 hectares are forested lands mostly belonging to the state, and 99,151 hectares are devoted to cash crop gardens (kebun) with tree and bush culture. Compared with the figures for 1980, a gradual decrease in the total area under cultivation may be noted, resulting mainly from population pressures and tourism development. This includes a real estate and building boom in the coastal resort areas and tourist handicraft villages such as Celuk and Ubud.
The cultivation of new, fast-growing, high yielding rice varieties, in concert with the application of chemical fertilizer, herbicides and pesticides, lies at the core of the government's agricultural development program (Bimas). Further aims are to improve methods of soil utilization and irrigation, and to set up new forms of cooperatives to provide credit and market surplus harvests. Over 80 percent of Bali's wet-rice fields are now subject to these intensification steps.
The hobby of bird watching is above all a delightful recreation, and no longer merely the province of collectors and academics. And what better place than Bali to indulge the urge? What pleasanter island, what wilder domain, and what fresher air in which to nurture it?
Beneath the canopy, the Magpie Robins endlessly disport and vent a rich vocabulary of imprecations and sweet fluting calls, whilst the restless Pied Fantail dashes to and fro, pirouettes and trips the light fantastic, characteristically flirting its tail the while. Always in evidence are the ubiquitous Yellow-vented Bulbuls, chattering and chortling, as they race each other from palm to palm.
Though precious little is known about the long, formative stages of Balinese prehistory, artifacts discovered around the island provide intriguing clues about Bali's early inhabitants. Prehistoric grave sites have been found in western Bali, the oldest probably dating from the first several centuries B.C. The people buried here were herders and farmers who used bronze, and in some cases iron, to make implements and jewelry. Prehistoric stone sarcophagi have also been discovered, mainly in the mountains. They often have the shape of huge turtles carved at either end with human and animal heads with bulging eyes, big teeth and protruding tongues.
The Dutch, complacent in their cocoon of colonial supremacy, were shocked when the Japanese invaded the Indies in 1942, so shocked that they gave up with hardly a fight. More shocking still to the colonialists was the fact that after the war the majority of Indonesians failed to welcome their former rulers back with open arms. Revolution! and Freedom! had instead become rallying cries around the archipelago, and these were taken up with fierce determination by the Balinese.
Bali has played a key role in Indonesia's recent development. The tourist "paradise" begun by the Dutch has been revised and given modern form, providing a lucrative income for many thousands of Balinese and significant amounts of foreign exchange for the nation.