From the Super Mario Wiki
The Twin Bridges are a pair of parallel bridges found in Dinosaur Land in the game Super Mario World. The Twin Bridges, combined with Cookie Mountain, make up the fourth world of Super Mario World, which is a sky based world. One bridge, the Cheese Bridge, is smaller than the other and only has one level. The larger and higher bridge is the Butter Bridge, which is accessed by a secret path in Vanilla Dome and connects the two mountaintops. There are two levels on this bridge. By reaching the secret exit of the Cheese Bridge level, Mario gains access to Soda Lake, which in turn leads to the third Star Road. Both bridges lead from Vanilla Dome to Ludwig's Castle.
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