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In page Geography of the Maldives:

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Some islands are marshy, while others are higher owing to sand and gravel having been piled up by wave action.[citation needed] Often the soil is highly alkaline, and a deficiency in nitrogen, potash, and iron severely limits agricultural potential.[1] Ten per cent of the land, or about 26 km2, is cultivated with taro, bananas, coconuts, and other fruit.[1] Only the lush island of Fuvammulah produces fruits such as oranges and pineapples – partly because the terrain of Fuvammulah sits higher than most other islands, leaving the groundwater less subject to seawater penetration.[1] However, as population grows, even in this island the cultivated areas are shrinking rapidly.[citation needed]