Solovetsky Islands
By the [[White Sea]], notably on the [[Solovetsky Islands]], there have been preserved more than 30 stone labyrinths. The most remarkable monument is the [[Stone labyrinths of Bolshoi Zayatsky Island]] – a group of some 13 stone labyrinths on 0.4 km2 area of one small island. Local archaeologists have speculated that these labyrinths may be 2,000–3,000 years old, though most researchers remain dubious.