Questions & Answers about Wij lopen de berg op.
Because Dutch often uses a postposition with movement expressions. In English, we say up the mountain. In Dutch, that idea is commonly expressed as de berg op — literally the mountain up.
So in Wij lopen de berg op, the words de berg op belong together and express the direction of movement.
It means up the mountain or up the hill.
A useful way to see it is:
- de berg = the mountain / hill
- op = up / onto
But in Dutch, the natural order here is de berg op, not op de berg, when the meaning is movement upward.
Because op de berg usually describes location, not direction.
- Wij lopen op de berg = we are walking on the mountain
- Wij lopen de berg op = we are walking up the mountain
So the sentence you have is about going upward, not just being on the mountain.