The term 'Mountain Myth' can be broken down into two crossword solutions: YETI (4 letters). The YETI, also known as the Abominable Snowman, is a mythical creature said to inhabit the Himalayan region of Nepal and Tibet. It is described as an ape-like creature, taller than an average human, covered in fur and with large feet. Sightings of the YETI have been reported for centuries, but no conclusive evidence has been found to prove its existence.