“The largest wave of any kind seen by humans was in Alaska in 1958 at 1,720 feet when an earthquake caused a landslide into a bay.”
It was only about 100 feet high. Boats survived.
The “1750 foot wave” came from the wash up the hillside immediately across the fiord from the landslide in Lituya Bay.
The actual 100 foot wave that resulted must’ve been awesome enough to the boaters in the bay. I can’t imagine what it was like seeing that thing looming out of the dark.
The one in Alaska that traveled across the bay was 500 feet higher than the Empire State Building!
1958 Lituya Bay earthquake and megatsunami
(I normally don't reference Wikipedia for anything, but I think this is pretty solid.