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Roubaix, Lille, Nord, Hauts-de-France, Metropolitan France, 59100, France (50.69159 3.17417)
The soft hollow plain, upon which Roubaix lies, stretches on an east-west oriented syncline axis which trends south-to-southeastward to the Paleozoic limestone of the Mélantois-Tournaisis faulted anticline. This area consists predominantly of Holocene deposits of alluvial origin. It is flat and low, with an elevation drop of only 35 m (114 ft 10 in) over its 13.23 square kilometres (5.11 sq mi). The lowest altitude of this area stands at 17 m (55 ft 9 1⁄2 in), while its highest altitude is 52 m (170 ft 7 in) meters above the sea level.