'Great City' in the Bible

"Arise, go to Nineveh, that great city, and proclaim against it, for their wickedness has come up before me."

"Arise, go to Nineveh, that great city, and proclaim to it the message that I give you."

So Jonah arose, and went to Nineveh, according to the word of the LORD. Now Nineveh was an exceedingly great city, three days' journey across.

Shouldn't I be concerned for Nineveh, that great city, in which are more than one hundred twenty thousand persons who can't discern between their right hand and their left hand; and also much livestock?"