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Barnacle Bay is an island in New England. After seeing old footage of a family trip to Barnacle Bay, Marge begins to feel nostalgic and as a result, Homer takes her there. Although the island of old was a paradise, the island the Simpsons saw was a disgusting dump. The main industries on the island are tourism and fishing for "Yum Yum Fish", but after a stern lecture from Lisa on the dangers of over-fishing, the island inhabitants switched over to logging. Lisa was not satisfied because that was even worse than fishing.

The Island has a store selling Caramel, a decaying boardwalk that was repaired and burnt down by Homer on exactly the same day, a Church, and a museum.