What is Nineveh called today?

Its ruins lie across the river from the modern-day major city of Mosul, in Iraq’s Nineveh Governorate. The two main tells, or mound-ruins, within the walls are Tell Kuyunjiq and Tell Nabī Yūnus, site of a shrine to Jonah, the prophet who preached to Nineveh.

Where is biblical Nineveh today?

Mosul
Nineveh, the oldest and most-populous city of the ancient Assyrian empire, situated on the east bank of the Tigris River and encircled by the modern city of Mosul, Iraq.