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[citation needed] The islands are all small—the aggregate land area is only 455 square kilometres (176 sq mi). [4] [5] Mahé is 25 kilometres (16 mi) long and no more than 8 kilometres (5.0 mi) wide, [4] with an area of 156.7 km 2 (61 sq mi). [citation needed] It contains the capital and only city, Victoria, an excellent port. [4]
Healthy tropical coral reefs grow horizontally from 1 to 3 cm (0.39 to 1.18 in) per year, and grow vertically anywhere from 1 to 25 cm (0.39 to 9.84 in) per year; however, they grow only at depths shallower than 150 m (490 ft) because of their need for sunlight, and cannot grow above sea level.