Myanmar | History, Map, Flag, Population, Capital, Language, & Facts
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Relief
Myanmar slopes from north to south, from an elevation of 19,296 feet (5,881 meters) at Mount Hkakabo (the country’s highest peak) in the extreme north to sea level at the Irrawaddy (Ayeyarwady) and Sittang (Sittoung) river deltas. The mountain ranges generally run from north to south. The country as a whole can be divided into five physiographic regions: the northern mountains, the western ranges, the eastern plateau, the central basin and lowlands, and the coastal plains.
The northern mountains consist of a series of ranges that form a complex knot at Mount Hkakabo. In terms of plate tectonics, this knot marks the northeastern limit of the encroaching Indian-Australian Plate, which has been colliding with the southern edge of the Eurasian Plate for roughly the past 50 million years and thrusting up the mountain ranges of Myanmar and beyond. This region contains the sources of several of Asia’s great rivers, including the Irrawaddy, which rises and flows wholly within Myanmar, and the Salween (Thanlwin), which rises to the north in China. The upper courses of these rivers all flow through deep gorges within a short distance of each other, separated by steep, sheer peaks.
Britannica Quiz Which Country Is Larger By Area? QuizThe western ranges traverse the entire western side of Myanmar, from the northern mountains to the southern tip of the Rakhine (Arakan) Peninsula, where they run under the sea and reappear as the Indian territory of the Andaman and Nicobar Islands. Their average elevation is about 6,000 feet (1,800 metrts), although some peaks rise to 10,000 feet (3,000 meters) or higher. The mountains consist of old crystalline rocks surrounded by hard, tightly folded sedimentary rocks on either side. From north to south, the Patkai Range, Naga Hills, and Chin Hills form the border between India and Myanmar. To the south of these are the Rakhine Mountains (Arakan Mountains), which lie entirely within Myanmar and separate the coastal strip from the central basin.
The Shan Plateau to the east rises abruptly from the central basin, often in a single step of some 2,000 feet (600 meters). Occupying the eastern half of the country, it is deeply dissected, with an average elevation of about 3,000 feet (900 meters). The plateau was formed during the Mesozoic Era (about 252 to 66 million years ago) and thus is a much older feature than the western mountains, but the plateau also shows more-recent and intensive folding, with north-south longitudinal ranges rising steeply to elevations of 6,000 to 8,600 feet (1,800 to 2,600 meters) above the plateau surface. Northward, the plateau merges into the northern mountains, and southward it continues into the Dawna Range and the peninsular Tenasserim Mountains (Tanintharyi Mountains), each a series of parallel ranges with narrow valleys.
Get Unlimited Access Try Britannica Premium for free and discover more. SubscribeThe central basin and lowlands, lying between the Rakhine Mountains and the Shan Plateau, are structurally connected with the folding of the western ranges. The basin was deeply excavated by the predecessors of the Irrawaddy, Chindwin, and Sittang rivers; the valleys are now occupied by these rivers, which cover the ancient soft sandstones, shales, and clays with alluvial deposits. In the deltaic regions formed by the Irrawaddy and Sittang rivers, the landscape is absolutely flat, and the monotony is relieved only by a few blocks of erosion-resistant rocks that are never more than 60 feet (18 meters) high. The basin is divided into two unequal parts, the larger Irrawaddy valley and the smaller Sittang valley, by the Bago Mountains. In the center of the basin and structurally connected with the Bago Mountains and their northern extension is a line of extinct volcanoes with small crater lakes and eroded cones, the largest being Popa Hill, at 4,981 feet (1,518 meters).
The coastal areas consist of the narrow Rakhine and Tenasserim plains, which are backed by the high ranges of the Rakhine and Tenasserim mountains and are fringed with numerous islands of varying sizes.
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