permafrost - a thick layer of soil that stays frozen all year, foothill - a low hill at the base of a mountain or mountain range, grassland - a large open area of land covered with grass, lowlands - land that is lower than the area around it, mountain range - a series of mountains in a line connected by high grounds, muskeg - a swampy area of water with lots of moss and stunted trees, plain - a large area of flat land with few trees, tundra - a cold area of frozen land with no trees, uplands - an area of high or hilly land, wetlands - land where there is much moisture in the soil,

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