 However, petroglyphs are abundant in the islands in the further reaches of the Polynesian triangle, particularly in Hawaii, the Marquesas, and Rapa Nui.Rapa Nui has the densest concentration of engravings in Polynesia as a whole; while the Pu'uloa petroglyphs site in Hawaiʻi has the largest number of petroglyphs in a single site at over 21,000 engravings.Polynesia also features megalithic sacred ceremonial centers generally known as "marae".