Although this article is based on canonical information, the actual name of this subject is pure conjecture. Please see the reasons for this title in the "[[::Sans Bridge#Behind_the_scenes|Behind the scenes]]" section below, and/or the relevant discussion on the talk page.
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Sans Bridge (also known as The Skeleton Bridge) was the point where The Herd first entered the Lost World. It was a bridge made from dinosaur skeletons that connected the underground cave system to the tunnel leading into the Lost World. The structure was strong enough to support the weight of Momma Dino, and it was also home to an Ankylosaurus that attacked The Herd.
Near the end of the film, the Herd and Buck, who had decided to return to the surface world, began crossing the bridge. As they did, Buck heard Rudy’s roar, confirming that Rudy was still alive. After saying goodbye to Diego, Buck chose to return to the Lost World and cut the vines holding the dinosaur bones together, destroying the bridge.
For many years, this remained the only way to access the Lost World, aside from crashing through the ground or emerging directly to the surface, as Scrat and Buck did. However, years later, another entrance was created, which allowed Crash, Eddie, and the rest of The Herd to return to, and in the case of the former two, eventually settle in the Lost World.
Trivia
It is unclear how the new entrance shown in The Ice Age Adventures of Buck Wild came to exist, since the Skeleton Bridge was believed to be the only link between the two worlds.
One possibility is that when Scrat unknowingly shattered Pangaea into separate continents by running across the Earth's inner core in Ice Age: Continental Drift, it drastically altered the underground cave system, closing the gap where the Skeleton Bridge once stood and creating the new entrance.
The likely species of the Sans Bridge could be Giganotosaurus, a carnivorous dinosaur from the Cretaceous period.
