 Their known world extended from "The Upper Sea" or Mediterranean coastline, to "The Lower Sea", the Persian Gulf and the land of Meluhha (probably the Indus Valley) and Magan (Oman), famed for its copper ores.Ziggurats (Sumerian temples) each had an individual name and consisted of a forecourt, with a central pond for purification.The temple itself had a central nave with aisles along either side.