The political boundaries of nations cross natural boundaries such as watersheds, habitats, and airsheds.

Simple: The boundary does not cross itself.

The boundary crosses the A46 just south of the roundabout, following Prial Drain.

The northern boundary of that area at 38 51' crosses just north of the Sacramento metro area.

Once the boundary crosses back over the canal, the river resumes its meandering course on the eastern side of the canal.

Had he gone against a divine plan, crossed the boundaries of some natural order?

At the point where the boundary crosses the railway to Ollerton, it meets Kirton.

The boundary crosses the A52 at a subway across the road, just south of the Butlins camp.

Later boundaries will often abut, but not cross earlier boundaries.

Serves the entire city of Corbin, making it one of the few districts in Kentucky whose boundaries cross county lines.