Nicaragua was inhabited by Paleo-Americans as far back as 12,000 BC. The ancient footprints of Acahualinca are 2,100-year-old fossils discovered along the shores of Lake Managua. Other archeological evidence, mainly in the form of ceramics and statues made of volcanic stone, like the ones found on the island of Zapatera, and petroglyphs found on Ometepe island, contribute to the increasing knowledge of Nicaragua's ancient history.