Mountain means height.
Snakes symbolized many things in ancient times, and people generally accepted jealousy and disaster.
There are also many allusions to the story of "cutting the snake", most of which describe an adventure.
If the mountain is bare and rocky, it means that in the near future, you may be hit, and the bad luck that has been lurking will follow, but don't worry, because you can save the day, and every dark cloud has a glimmer of hope.
If there are quite a few trees on the mountain, it means that you probably did a good deed unintentionally and got care of.