Gilligan's Island is a typical South Pacific tropical Island with beaches, mountains, jungles, and a lagoon. It was where the seven passengers aboard the S.S. Minnow were marooned. It is also in the target line of the United States Air Force experimental missile range. The neighboring islands are inhabited by Natives that practice rites similar to Voodoo (a Caribbean religion from Africa) and collect the heads of rival tribes. There are a few friendly tribes often visited by sailors who explore the islands in the area. Gilligan saves a female native from one tribe while a local chieftain appears on the island in search of a White Goddess.
Gilligan's island is said to be "a tiny island somewhere in the South Pacific." Though, throughout the series, such features as quick-sand, an active volcano, staggering mountains, and not to mention extensive jungles add to it all. It's unexplained how all these landmarks fit on such a small island.
The island's position is also uncertain as the Skipper and the Professor have different ideas on its position. In the X Marks the Spot, the island's position is said to be about 140 longitude by 10 latitude as according to the Professor. However, in the episode Big Man on a Little Stick, the Skipper tells surfer Duke Williams that their position is approximately 110 longitude by 10 latitude. Furthermore, in It's a Bird, It's a Plane, when the US Navy see Gilligan flying over the island, the location is reported as 250 miles south of Hawaii; so possibly, during their time on the island, the Skipper and Professor are constantly refining and recalculating their position based on storm reports through the radio. Despite being reportedly "uncharted," it is known the island was used as a temporary landing field and army base during World War Two, due to the Army weapons and Air Force planes found much later on the island. In Gilligan Goes Gung-Ho, at least one Coast Guard pilot mentions that he knows about the island not being on the map and convinces the other pilot to fly over it.
Different real-life islands are also portrayed as being the island in the first season's theme song and that of the second season as well as in different shots in different episodes. The photo at upper left from Forward March and Man With a Net episode show approximate maps of the Island; although in Splashdown, it shows a different map of the island from space which leaves out the mountains and clearings. Apparently, there is a small lagoon a short walk from the hut area and a wide beach where the S.S. Minnow was shown wrecked in the First Season; a continuity error for the Second and Third episode opening credits scenes that show the wreck of the SS Minnow on the lagoon.
- Caves in numerous episodes
- cliffs in Take A Dare, Man With a Net and Agonized Labor
- a gold mine in The Big Gold Strike
- the lagoon
- a mountain range in Man With a Net
- a mud bog in High Man on the Totem Pole
- a quicksand pit in Where There's a Will and Man With a Net
- volcano in Operation: Steam Heat
- the waterfall
- Two separate islands were used in the opening credits of the series. One was Sandy Cay, a 3-acre island near the Bahamas in the Caribbean. It is now one of the many destinations featured on Disney Cruise Lines, most likely being Castaway Cay, but it is unknown which of the islands were filmed. The island seen from a distance during the color episodes was Mokuoloe ("Coconut Island") near Oahu which covers 28-acres in size.