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Posts tagged Blue Mountains

Plains and Mountainous Plateaux Around Sydney, Australia

33.8S 151.2E

December 26th, 2009 Category: Snapshots

Australia - November 30th, 2009

Australia - November 30th, 2009

Sydney, the state capital of New South Wales, is the largest city in Australia. It is located on low hills on the country’s southeast coast along an inlet of the Tasman Sea, in the lower half of this orthorectified image.

Sydney’s urban area is in a coastal basin, which is bordered by the Pacific Ocean to the East, the Blue Mountains to the West, the Hawkesbury River to the North and the Royal National Park to the South. It lies on a submergent coastline, where the ocean level has risen to flood deep river valleys (ria) carved in the hawkesbury sandstone. Port Jackson, better known as Sydney Harbour, is one such ria and is the largest natural harbour in the world.

Geographically, Sydney lies over two regions: the Cumberland Plain, a relatively flat region lying to the south and west of the harbour, and the Hornsby Plateau, a sandstone plateau lying mainly to the north of the harbour and dissected by steep valleys. The parts of the city with the oldest European development are located in the flat areas south of the harbour. The North Shore was slower to develop because of its hilly topography and lack of access across the harbour.

Lake Albert, Straddling the Border Between Uganda and the Democratic Republic of the Congo – March 31st, 2009

March 31st, 2009 Category: Image of the day, Lakes

Uganda - March 24th, 2009

Uganda - March 24th, 2009

Lake Albert, one of the Great Lakes of Africa, is located in the center of the continent, on the border between Uganda (left) and the Democratic Republic of the Congo (right). It is Africa’s seventh largest lake, and ranks as the world’s twenty-seventh largest lake by volume.

Lake Albert is the northernmost of the chain of lakes in the Great Rift Valley; it is about 160 km (100 mi) long and 30 km (19 mi) wide, with a maximum depth of 51 m (168 ft), and a surface elevation of 619 m (2,030 ft) above sea level.

Lake Albert is part of the complicated system of the upper Nile. Its main sources are the Victoria Nile, ultimately coming from Lake Victoria to the southeast, and the Semliki River, which issues from Lake Edward to the southwest. Here, the Semliki is spilling greenish sediments into the lake at the southern end.

The water of the Victoria Nile is much less saline than that of Lake Albert. Its outlet, at the northernmost tip of the lake, is the Albert Nile (which becomes known as the Mountain Nile when it enters Sudan).

At the southern end of the lake, where the Semliki enters, there are swamps. Farther south loom the mighty Ruwenzori Range, while a range of hills called the Blue Mountains tower over the northwestern shore.

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