This is the 16027th most frequent Korean word.
북에
"북에" means "to the north" or "in the north" in English.
In this sentence, '북에' is used to indicate the destination 'the north.'
나는 북에 여행을 갔다.
I traveled to the north.
Here, '북에' describes the location of the mountain as being 'in the north.'
그가 북에 있는 산에서 등반을 했다.
He climbed a mountain located in the north.
In this case, '북에' signifies the subject of discussion, which is 'the north.'