Sumer is the site of the earliest known civilization, located in the southernmost part of Mesopotamia, between the Tigris and Euphrates rivers. This area later became Babylonia, and is now known as southern Iraq, stretching from Baghdad to the Persian Gulf. The first civilisation in Sumer was that of the Ubaidians – they actively practised agriculture, developed trade, and established industries, including weaving, leatherwork, metalwork, masonry, and pottery.