Piispankivi (Bishop's Stone) is the ancient remains of the Perämeri's National Park, located in the northern part of Island Iso-Huituri is considered to be the most historically significance. The Bishop's Stone is an aggregate border mark built of large stones about 6 meters long and more than 2 meters high.
The Bishop's Stone is considered the southern border mark point of the dioceses of Turku and Uppsala and a commemoration of the diocesan border crossing in the late 16th century.