Glacial erratics and similar natural stones were often used as boundary markers between properties. Knowledge of their locations was typically maintained by oral tradition, wherein men of each house would walk the length of the border. These stones then became boundary markers for municipalities, and eventually provinces and countries. For example, Kuhankuono is a stone that marks the multipoint border between seven municipalities in Kurjenrahka National Park near Turku. Today, however, steel rods topped with a cube painted orange are usually used. Municipalities often post a traffic sign featuring their coat of arms on the border on major roads. On the Finnish-Russian border, many historical border stones, marked with Swedish and Imperial Russian symbols, are still in use. The actual Finnish-Russian border is marked by small white bollard, but on both sides of the border there are large striped bollards decorated with a coat of arms: a blue/white bollard on the Finnish side, a red/green bollard on the Russian side. Artificial cairns are found on the Norway-Russia-Finland tripoint (Treriksrøysa) and Norway-Sweden-Finland tripoint (Three-Country Cairn). The Sweden-Finland border on Märket is marked with holes drilled to the rock, because seasonal pack ice can shear off any protruding markers. In folklore, a type of haltija, "rajahaltija", a kind of a local spirit, was believed to haunt borders that had been unjustly moved.