Lighthouse: The main structure, where the Turbots live. The top floor contains a big lamp that Cap'n Turbot uses to direct ships out at sea. The middle floor is Cap'n Turbot and Francois' room. It has blue-striped walls, rectangle-shaped windows, and curtains with an anchor pattern. The bottom floor has green walls, an entryway, and a staircase.
Shack: At the foot of the island is a small shack where the Turbots keep their supplies, like buckets of food for Wally. In season one, the shack is painted gray with a dark blue roof and brown door. In all later episodes, its appearance is changed to an orange shack with a teal blue door and turquoise roof.
Dock: There is a long wooden dock that goes from the bottom of the island to the water. The Flounder and the Diving Bell are usually docked here.
Cap'n Turbot: Cap'n Turbot looks after the island's lighthouse. He operates it at night and during severe weather.
Francois Turbot: Francois lives in the lighthouse along with his cousin.
Wally: Wally lives in the waters surrounding Seal Island. He usually stays on the Flounder when it is docked.