| rdfs:comment | - The first inhabitants of New Guinea arrived at least around 40,000 years ago, having travelled through the south-east Asian peninsula. These first inhabitants, from whom the Papuan people are probably descended, adapted to the range of ecologies and in time developed one of the earliest known agricultures. Remains of this agricultural system, in the form of ancient irrigation systems in the highlands of Papua New Guinea, are being studied by archaeologists. This work is still in its early stages so there is still uncertainty as to precisely what crop was being grown, or when/where agriculture arose. Sugar cane was cultivated for the first time in New Guinea around 6000 B.C.
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| abstract | - The first inhabitants of New Guinea arrived at least around 40,000 years ago, having travelled through the south-east Asian peninsula. These first inhabitants, from whom the Papuan people are probably descended, adapted to the range of ecologies and in time developed one of the earliest known agricultures. Remains of this agricultural system, in the form of ancient irrigation systems in the highlands of Papua New Guinea, are being studied by archaeologists. This work is still in its early stages so there is still uncertainty as to precisely what crop was being grown, or when/where agriculture arose. Sugar cane was cultivated for the first time in New Guinea around 6000 B.C. A central east-west mountain range dominates the geography of New Guinea, over 1600 km in total length. The western half of the island of New Guinea contains the highest mountains in Oceania, rising up to 4884 m high, and ensuring a steady supply of rain from the equatorial atmosphere. The tree line is around 4000 m elevation and the tallest peaks contain permanent equatorial glaciers — which have been retreating since at least 1936. Various other smaller mountain ranges occur both north and west of the central ranges. Except in high elevations, most areas possess a warm humid climate throughout the year, with some seasonal variation associated with the northeast monsoon season. Another major habitat feature is the vast southern and northern lowlands. Stretching for hundreds of kilometres, these include lowland rainforests, extensive wetlands, savanna grasslands, and some of the largest expanses of mangrove forest in the world. The southern lowlands are the site of Lorentz National Park, also a UNESCO World Heritage Site. The Sepik, Mamberamo, Fly, and Digul rivers are the island's major river systems that drain in roughly northeast, northwest, southeast, and southwest directions respectively. Many of these rivers have broad areas of meander and result in large areas of lakes and freshwater swamps. New Guinea contains many of the world’s ecosystem types: glacial, alpine tundra, savanna, montane and lowland rainforest, mangroves, wetlands, lake and river ecosystems, seagrasses, and some of the richest coral reefs on the planet.
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