He fells trees on the mountain.

He fell down in the mountain.

His airplane crashed in the mountains.

Run and hide in the mountains.

At one time I lived alone in the mountains.

The air is very pure in the mountains.

Mr. Yamanaka looks young for his age.

I was roaming over the mountains all through the night.

The treasure is believed to lie hidden somewhere in the mountain.

The river has its origin in the Japan Alps.

The path twists through the mountains.

The explorer pushed his way through the trackless mountain region.

There is definitely a way to quit the world and live like an hermit in the mountains, being self-sufficient and without contact with anybody while not dying like a dog.

I heard that they discovered the footprints of an abominable snowman in the Himalayan mountains.