英和和英

出典:『Wikipedia』 (2011/07/14 16:25 UTC 版)

英語による解説

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Perth Canyon is a submarine canyon located on the edge of the continental shelf off the coast of Fremantle, Western Australia, approximately 22 kilometres (14 mi) west of Rottnest Island. It was carved by the Swan River, probably before the Tertiary, when this part of the continental shelf was above sea level. It is an average of 1.5 kilometres (5,000 ft) deep and 15 kilometres (9.3 mi) across, making it similar in dimension to the Grand Canyon.