Three-Country Cairn

The Three-Country Cairn is the tripoint at which the international borders of Sweden, Norway and Finland meet, and the name of the monument that marks the point. It is the northernmost international tripoint in the world.The border between Norway and Sweden including Finland was decided in the Strömstad Treaty of 1751 and marked with cairns the following years, including cairn 294 which is located on a hill 150 meters east of today's Three-Country Cairn. When Sweden ceded Finland to Russia in 1809, it was decided that the new Finland–Sweden border should follow the rivers.

Source: Wikipedia