1. the upper limits of tree growth on mountains or in polar regions, beyond which trees cannot survive due to harsh climate conditions
Usage: geography; ecology

Examples

• The hikers reached the timberlines and could see only alpine vegetation above.
• Climate change is causing timberlines to shift higher up mountain slopes.
• Above the timberlines, the landscape becomes barren and rocky.
• Scientists study timberlines to understand how forests respond to temperature changes.
• The timberlines in the Rocky Mountains vary depending on local weather patterns.
• Photography enthusiasts often capture the stark beauty of timberlines.
• Different tree species create distinct timberlines at various elevations.