Sumer
Sumer () is the earliest known civilization in the historical region of southern Mesopotamia, modern-day southern Iraq, during the Chalcolithic and Early Bronze ages, and one of the first civilizations in the world along with Ancient Egypt and the Indus Valley. Living along the valleys of the Tigris and Euphrates, Sumerian farmers were able to grow an abundance of grain and other crops, the surplus of which enabled them to settle in one place. Prehistoric proto-writing dates back before 3000 BC. The earliest texts, from c. 3300 BC, come from the cities of Uruk and Jemdet Nasr; early cuneiform script emerged around 3000 BC.
Proto-Elamite
A few Proto-Elamite signs seem either to be loans from the slightly older proto-cuneiform (Late Uruk) tablets of Mesopotamia, or perhaps more likely, to share a common origin. Whereas proto-cuneiform is written in visual hierarchies, Proto-Elamite is written in an in-line style: numerical signs follow the objects they count; some non-numerical signs are 'images' of the objects they represent, although the majority are entirely abstract.