Rock art in central Micronesia (Chuuk, Pohnpei, and Kosrae), in contrast, are dominated by rock engravings with motifs tying it to the rock art traditions of Island Melanesia. They include curvilinear shapes like spirals and concentric circles, tree-like shapes, and the distinctive "enveloped cross" motif. The Pohnpaid petroglyphs are the largest assemblage of rock engravings in the region, with motifs dominated by footprints, enveloped crosses, and outlined "sword-paddles". Central Micronesia also hosts the ruins of the stone cities of Nan Madol (1,180–1,200 CE) and Leluh (1,200–1,800 CE), in the islands of Pohnpei and Kosrae, respectively.