I go hiking in the mountains every weekend.

We reached the summit of the mountain.

The source of this river is at the top of the mountain.

We often have picnics by the river on weekends.

We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

The source of this river is at the top of the mountain.

Mountainous areas are ideal for hiking.

I climbed three mountains.

Mr. Yama is my best friend.