Answer: snowline

AnswerCrossword Clue
SNOWLINE

Boundary of a mountainous region.

SNOWLINE

In the Alps, it's about 9,000 ft.

SNOWLINE

9,000 ft. in the Alps.

SNOWLINE
Type of boundary on a mountain.
SNOWLINE
Mountain demarcation
SNOWLINEDemarcation affected by warming
SNOWLINEWinter sight on some mountains