One-third of Morocco is mountainous. Casablanca, the largest city, chief port and major manufacturing centre of the country, is visible along the coast. The topography east of Casablanca is dissected plateau and hilly terrain. Annual rainfall seldom exceeds 30 centimeters for any part of this region, although rainfall amounts increase slightly from the west coast towards the Atlas Mountains. These mountains extend across the entire southeastern frontier of Morocco and form a major physical barrier for ground transportation. Several dark green areas show the larger concentrations of agricultural activities. A small section of the northeast-southwest trending Atlas Mountains can be seen as a well-defined line of snow-capped mountains, with remaining snow found only at altitudes exceeding 2,700 metres. Several peaks within the Atlas range exceed 3,600 metres above sea level.

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