Blue Hole (Big Pine Key)
The Blue Hole is an attraction on the island of Big Pine Key in the Florida Keys. It is an abandoned rock quarry that was used for nearby road fills and Henry Flagler's Overseas Railroad. The water it contains is mostly fresh and is used by various wildlife in the area, such as birds, snakes, alligators, key deer and green iguanas. It is part of the National Key Deer Refuge.
Schuylkill Gap
Schuylkill Gap is a water gap through Blue Mountain located about 3 miles north of Hamburg, Pennsylvania. The borough of Port Clinton, Pennsylvania resides within the gap itself.
Formed in much the same way as Pennsylvania's other water gaps, Schuylkill Gap is near Hawk Mountain, Weiser State Forest, and some State Game Lands. PA Route 61 as well as the Schuylkill River pass through the gap.