tun·dra 
(tŭndrə)
(tŭndrə)n.
1. A treeless area beyond the timberline in high-latitude regions, having a permanently frozen subsoil and supporting low-growing vegetation such as lichens, mosses, and shrubs.
2. A similar area found at high elevations.
[Russian, from Sami tūndar, flat-topped hill.]