Question

An advertiser targeting only france determines that clicks have been received from people in switzerland. why might ts happen?

Answer 1

The reason as to why this might happen is that :

People who are located in Switzerland are searching through Google using France - related words like '' le tour Eiffel ''

By default one will be able to reach people whose physical location is one 's targeted areas.

It is also applicable to those who show interest in one' s targeted area.

If for instance one restricts people from outside of a targeted location one may need to choose '' reach people in your targeted location'' in one's advance location targeting option.

The above information answers the question pretty well.