Found my kayak. The one.

[Cataboo]

I think the southernmost fjord is in Quebec, up near the Saguenay and Tadoussac. I've kayaked there, and it seemed like a fjord to me.

Mount Desert Island in Maine claims it has a fjord with the Sommes sound.

Keyword is claimed.

They have a small section of 1,000 foot high cliffs. I feel like posting pics all over the place today.