The primordial deities are the first beings that existed. They are what makes up the universe. All other gods descend from them. The first among them is usually said to be Chaos. Chaos is the nothingness from which all of the others were made. These gods are usually depicted as a place or a realm. Tartarus, for example, is depicted as the deepest pit in the underworld. His brother Erebus is also depicted as a place of darkness, or the emptiness of space. Gaia is depicted as nature or the Earth. Pontus is depicted as the oceans, lakes, and rivers. Chronos is depicted as time.