What is nineveh in the Old Testament and why is it important?

In 689 B.C. Babylon was destroyed by powerful rulers from a northern Mesopotamian city called Nineveh. About 60 years later the Babylonians were able to rebuild Babylon and make the capital of an even stronger empire. So basically Nineveh made the Babylonian people stronger than before because they expanded and therefore they have more power. In the end Nineveh became a powerful state in Mesopotamia. If your wondering what Mesopotamia has the meaning of "land between the rivers" Tigress and Euphrates river it also had an area called a fertile crescent. which means it is a rich food growing area were most of the land is to dry to farm.