During this time, the most important of the Jewish centres in Mesopotamia, a region called "Babylonia" in Jewish sources and later known as Iraq, were Nehardea, Nisibis (modern Nusaybin), Mahoza (al-Mada'in, just to the south of what is now Baghdad), Pumbedita (near present-day al Anbar Governorate), and the Sura Academy, probably located about 60 kilometers south of Baghdad.