Did Christopher Columbus ever figure out that he had not reached Asia when he discovered America?

With each trip Columbus kept trying to push westward, believing if he could just get through these islands, he’d reach the ports of Japan and the Imperial Palace in China, the places he’d set out to find in the first place.

Of course, he never did, but he died believing that all of the spots he’d visited in the Americas were actually parts of Asia.

Which is quite the shame, because his discoveries were monumental nevertheless.