Possible Clues:

• Milieu for John Muir, with "the"
• Craggy ranges
• Soldiers included in new rises - sharp rises
• Morena, Leone and Madre
• Mountainous areas in the middle of Russia on the radio
• Dossier rashly contains mountain ranges
• Sharply pointed mountain ranges
• California mountains, informally
• Mount Whitney's range, casually
• Tahoe's mountains