Why is Switzerlands border wriggly?

Answer 1

The Swiss border is no more or less wiggly than that of any other European countries.

Part of the border runs along rivers, then it is a wiggly as the river.

Part runs through lakes (Lake Geneva and Bodensee). This part is relatively straight.

The land borders are marked by border stones. This is the same system used the world over. The border then officially runs in a straight line from one border stone to the next. The stones are about 100 - 400 metres apart, within sight of each other. Thus the border is made up of a large number of straight lines.

This is the same system used for marking out the boundaries of the land belonging to a town or village. If two villages are in two different countries, then the border between the villages becomes the international border.