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.
Jackson Hole
Jackson Hole is a valley between the Teton Mountain Range and the Gros Ventre Range in Wyoming sitting near the border of Idaho. The term "hole" was used by early trappers or mountain men, who primarily entered the valley from the north and east and had to descend along relatively steep slopes, giving the sensation of entering a hole. These low-lying valleys surrounded by mountains and containing rivers and streams are good habitat for beaver and other fur-bearing animals.