Alvar is a type of open, treeless landscape characterized by a thin layer of soil over limestone or dolostone bedrock. This unique ecosystem is often found in regions with a cold climate, such as parts of Finland and Sweden. Alvars support a variety of specialized plant species that have adapted to the harsh conditions, including low-growing grasses and wildflowers. The term "alvar" is derived from the Swedish word "alv," meaning "elf," reflecting the mystical quality of these landscapes. Alvars are important for biodiversity, providing habitats for various animals and plants, and are often protected as natural reserves to preserve their ecological significance.