Translation of "Boundary" in Chinese

The Rhine is the boundary between France and Germany.

莱茵河是分隔法国和德国的界线。

There is a fence marking the boundary between our yard and the neighbor's.

- 我家和邻居家以院子之间的篱笆为分界线。
- 我家院子和邻居家院子之间有一道篱笆做为分界线。.