The Australian continent extends from east to west some 2,400 mi (3,860 km) and from north to south nearly 2,000 mi (3,220 km). It is on the whole exceedingly flat and dry. Less than 20 in. (50.8 cm) of precipitation falls annually over 70% of the land area. From the narrow coastal plain in the west the land rises abruptly in what, from the sea, appear to be mountain ranges but are actually the escarpments of a rough plateau that occupies the western half of the continent. It is generally from 1,000 to 2,000 ft (305–610 m) high but several mountain ranges rise to nearly 5,000 ft (1,520 m); there are no permanent rivers or lakes in the region. In the southwest corner of the continent there is a small moist and fertile area, but the rest of Western Australia is arid, with large desert areas.
The northern region fronts partly on the Timor Sea, separating Australia from Indonesia....
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