To which region did God tell Abraham to take Isaac as an offering?

Answer: Moriah

God told Abraham to go to the land of Moriah and offer Isaac on one of the mountains He would show him.

““Take your son,” God said, “your only son Isaac, whom you love, and go to the land of Moriah. Offer him there as a burnt offering on one of the mountains, which I will show you.””— Genesis 22:2 (BSB)