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1.2.1.3. Lakes of the world
Among the great variety of inland water bodies, perennial lakes comprise 1.7 million km2, one million km2 of which are large lakes (larger than 100 km2). The distribution and size of lakes vary considerably among continents. North America possesses the greatest freshwater large lake surface area, whereas large lakes are uncommon in South America. Although there is a large number of lakes in the temperate zone of Europe and Asia, lakes are less common in tropical Asia - however some, such as the Great Lake on the Tonle Sap in Cambodia and Lake Tempe in Sulawesi (Indonesia) are of the utmost importance to fisheries. Africa, especially East Africa, is endowed with numerous lakes that support very important fisheries, in turn providing a livelihood to millions of people and contributing significantly to food supply. In many of these lakes, fisheries are reaching a state of maturity and consequently management problems are rising. For 11 lakes, shared by 11 countries of Eastern Africa, fisheries employs close to half a million people, with perhaps three times as many engaged in secondary activities and related services, thus supporting about 4 percent of the population of the region as a whole.
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