The Great Sphinx of Giza, commonly referred to as the Sphinx, is a limestone statue of a reclining or couchant sphinx (a mythical creature with a lion's body and a human head) that stands on the Giza Plateau on the west bank of the Nile in Giza, Egypt. It is the largest monolith statue in the world, standing 241 feet long, 20 feet wide, and 66.34 feet high. It is the oldest known monumental sculpture, and is commonly believed to have been built by ancient Egyptians of the Old Kingdom during the reign of the pharaoh Khafra (c. 2558–2532 BCE).