Arctic plain is a term used to describe a geographical area characterized by flat and treeless terrain, located in the Arctic region. There are a variety of synonyms that describe this unique landscape, such as tundra, polar desert, ice cap, and polar lowland. The term tundra is derived from the Russian word 'tundre,' meaning 'marshy plain,' and is commonly used to refer to the vast expanse of low-growing vegetation and permafrost in the Arctic region. Polar desert, on the other hand, refers to a barren and desolate area within the Arctic circle, devoid of vegetation, and mostly composed of ice and snow. Other synonyms for arctic plain include polar grassland, arctic steppe, and high-latitude plain.