**Alvars (Ecosystem)**: Limestone grasslands with unique flora and fauna.

**Alvars (Wetland Type)**: A wetland ecosystem on limestone bedrock.

**Alvars (Geological Feature)**: Flat, open landscapes overlying shallow soils.

Alvars (Ontario) - Unique grassland ecosystems in Ontario, Canada.

Alvar Crater - Geological feature located on the Moon's surface.

Alvar Nature Reserve - Protected area for biodiversity in Estonia.

Alvars of Gotland - Limestone plateaus supporting rare flora and fauna in Sweden.

Alvar Lake – Specific lake designated by its unique ecosystem features.