Petroglyphs of Sikachi-Alyan  Petroglyphs of Sikachi-Alyan are Petroglyphs on basalt rocks located near the Sikachi-Alyan Nanai village (Khabarovski krai, Russia). The oldest of the Sikachi-Alyan petroglyphs dated to 12000 - 9000 BC. These petroglyphs have been known to local people for many centuries; the first scientific research about these rocks was done in 1859 by Richard Maack. Petroglyphs are located on the Amur river bank downstream from the Sikachi-Alyan village. These rocks are easily accessible for viewing. Petroglyphs are located on the Amur river bank upstream from the Sikachi-Alyan village.