The Pag triangle is an isosceles triangle-shaped formation on the Tusto chelo hill, near Novalja on the island of Pag. Since the discovery itself, the unusual formation has become a hot topic among scientists trying to discover its origin.The triangle was discovered quite by accident by the Croatian surveyor Zdenko Grbavac during measurements at the quarry. He noticed a triangular formation that differed in color from the rest of Tusto Celo hill and measured it. He found that the formation was a regular triangle with two sides 32 meters long and a third 22 meters long. Upon further examination, it was concluded that the properties of this stone are not similar to any other surrounding rock. What made this triangle even more interesting were the 30-centimeter-deep holes on each side of the triangle for which no one could offer an explanation. This discovery attracted a lot of attention from the media, ufologists and tourists, all of whom were on the triangle.Geological surveys have concluded that the rocks within the triangle are of different colors due to exposure to extreme temperatures in the past. This megalithic formation is thought to be 12,000 years old.