I learned a new word and a new Geological feature from the McElroys 'Tombolo'. From Wikipedia, "Tombolo ...is a deposition landform in which an island is attached to the mainland by a narrow piece of land such as a spit or bar. Once attached, the island is then known as a tied island. A tombolo is a sandy isthmus."

This may not be a Tombolo. But, it is Tombolo-ish. Where in Algonquin Park is this?