Mountain
The mountain radical and the mountain kanji are the same.
Make sure you're studying your radicals. If you are, then you're studying your kanji as well!
さん
やま
None
Think about mountains talking to each other, calling each other by their names and adding the Japanese name-ender san (さん) to each of their names. "Hello, Everest-san." "Oh hi, Fuji-san."
Be sure to imagine this vividly. The more absurdly you can imagine it, the more likely you are to remember the reading, san.