In physical geography, tundra is a biome where the tree growth is hindered by low temperatures and short growing seasons. There are three types of tundra: Arctic tundra, alpine tundra, and Antarctic tundra. The vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. Scattered trees grow in some tundra. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline.

Source: Wikpedia<-i>

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National Geographic - Tundra
Facts, photos, and videos. And a story about what threatens this ecosystem.
Wikipedia - Tundra
Information about the different types of tundra.
WWF - Tundra Ecoregions
Description of the several tundra ecoregions that are distinghuised by the WWF.
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