Mountains are a large tectonic landforms that stretch above surrounding lands in limited areas, usually in the form of a peak. Mountains are generally steeper than hills and are formed through tectonic forces or volcanism. These forces can locally raise the surface of the earth, eroding slowly through the action of rivers, weather conditions and glaciers. Although not obvious in the long distance images of the island, the castaways seem to preside at the base of a mountain on the island riddled with caves created by the volcano, also located on the island. Mary Ann suggests the Skipper fake a broken leg on one of the cliffs to make Gilligan a hero in How to Be a Hero, Lord Beasley Waterford traipses through the area in pursuit of the Pussycat Swallowtail and George Barkley hides out here during his clandestine radio broadcasts, later tossing his transmitter off a cliff, perhaps the same cliff from which Lord Beasley and even Gilligan take falls. Mr. and Mrs. Howell even debate tossing themselves off from the peak in Agonized Labor.
- The mountain view in Man With a Net is actually stock footage; it's actual source is unrevealed.
- During the fly-over by the Navy plane of the island in Gilligan Goes Gung-Ho, there is no trace of the mountains depicted in Man With a Net.