Answer: MTN
MTN is a crossword puzzle answer that we have spotted 81 times.
    - Quite a hgt.
 
    - Map abbr.
 
    - Val.'s opposite
 
    - Bear, e.g.: Abbr.
 
    - Matterhorn, e.g.: Abbr.
 
    - Range part: Abbr.
 
    - K2 is one: Abbr.
 
    - Everest, e.g.: Abbr.
 
    - Atlas abbr.
 
    - Any of the Great Smokies: Abbr.
 
    - Fuji, e.g.: Abbr.
 
    - Part of a range: Abbr.
 
    - High point: Abbr.
 
    - New York's Bear ___: Abbr.
 
    - Matterhorn, e.g. (abbr.)
 
    - Feature with a high elev.
 
    - St. Helens, e.g.
 
    - Part of a range (abbr.)
 
    - Washington or McKinley: Abbr.
 
    - Part of 39-Down: Abbr.
 
    - Whitney or Shasta: Abbr.
 
    - Topography abbr.
 
    - Peak: Abbr.
 
    - Rockies abbr.
 
    - High pt. in an atlas
 
    - Topographer's abbr.
 
    - Chain part: Abbr.
 
    - Pikes Peak, for one: Abbr.
 
    - Whitney or Rushmore (Abbr.)
 
    - K2, for one: Abbr.
 
    - Map feature with an elev.
 
    - High pt.
 
    - Devils Tower, e.g.: Abbr.
 
    - Setting for many an SUV commercial: Abbr.
 
    - Geol. formation
 
    - Denali or Whitney
 
    - Part of 67-Across: Abbr.
 
    - N. Mex. time zone
 
    - McKinley, e.g.: Abbr.
 
    - Natural elev.
 
    - Peak (Abbr.)
 
    - Everest or Fuji: Abbr.
 
    - Pt. of a range
 
    - Geog. abbreviation
 
    - Rainier, e.g.: Abbr.
 
    - ___ Dew
 
    - Kilimanjaro, e.g.: Abbr.
 
    - Sugarloaf or Pinnacle (abbr.)
 
    - Any of the Andes: Abbr.
 
    - Everest e.g.
 
    - Whitney or Washington: Abbr.
 
    - Wd. before Dew on cans
 
    - High-elev. spot
 
    - Everest or Fuji (abbr.)
 
    - 52-Down, e.g.: Abbr.
 
    - Everest, for one (Abbr.)
 
    - Any of Colorado's fourteeners: Abbr.
 
    - Hood, for one: Abbr.
 
    - Abbr. in cartography
 
    - Rocky unit: abbr.
 
    - Sherpa's domain: Abbr.
 
    - Rainier or Rushmore: Abbr.
 
    - Denali, e.g.: Abbr.
 
    - Range element: Abbr.
 
    - Abbr. on KICKSTART drink cans
 
    - 1-Down part: Abbr.
 
    - Any of the Alps: Abbr.
 
    - ___ Dew (stylized brand name)
 
    - Any of the 6-Across: Abbr.
 
    - Any of the Sierra Nevadas: Abbr.
 
    - Half a name on soda bottles
 
    - Part of MST
 
    - Cheyenne, e.g.: Abbr.
 
    - Topological abbr.
 
    - ___ Dew Baja Blast
 
    - Kilimanjaro is one (Abbr.)
 
    - K2 or Fuji (Abbr.)
 
    - Any of the Tetons: Abbr.
 
    - Any of the Rockies: Abbr.
 
    - Geographical abbr.
 
    - High-elev. place