In fact, the oceans, as we know them today, are no older than 200 million years, about 1/20 of Earth's history. The origin of the oceans is closely linked to the formation of the atmosphere and the cooling of the planet and the formation of the lithosphere.
The Inca empire was based in Peru. Note that the empire spread in more countries then just the seat of the empire, like Ecuador, Bolivia, Colombia, Chile and Argentina.