Ovoo, oboo, or obo (Mongolian: овоо, Buryat: обоо, Khakas: обаа, Traditional Mongol: ᠣᠪᠤᠭ ᠠ, "heap"; Chinese: 敖包 áobāo, lit. "magnificent bundle [ shrine]") are sacred stone heaps used as altars or shrines in Mongolian folk religious practice and in the religion of other Mongolic peoples. They are usually made from rocks with wood.