timberline.

The boundary beyond which trees cannot grow because of altitude or latitude.

Use it for

Words that belong together

• above timberline
• alpine timberline

On the page

They camped just below timberline, among wind-bent pines.

Usage notes

Primary category: setting / environment. Forms: Singular timberline; plural timberlines. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: setting, description. Commonness: uncommon.