tree line.

The boundary beyond which environmental conditions generally prevent trees from growing.

Use it for

Words that belong together

• alpine tree line
• northern tree line

On the page

Above the alpine tree line, the path crossed exposed stone.

The northern tree line moved between scattered groves and open tundra.

Usage notes

Primary category: environment. Forms: Singular tree line; plural tree lines. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.