Ancient Babylonian Geometrical Cuneiform Tablet "Si.427"
 
Si.427 is a Babylonian clay tablet from Sippar in Northern Mesopotamia dating from 1900 to 1600 BCE, depicting a land survey. The tablet is currently on display at the Museum of the Ancient Orient, part of the Istanbul Archeology Museums. The tablet dates from the Old Babylonian (OB) period and was discovered in the late 19th century in what is now central Iraq.