The Troll Bridge is dark blue and is located above a very narrow valley. The Troll bridge has appears in multiple episodes of Dora the Explorer. it is unknown weather the there are multiple bridges that are above the narrow and small valley or if there is one and is on a path that several paths merge with which would explaining why Dora and Boots cross it multiple times while going to different places.
Dora and Boots have crossed the Troll Bridge in some episodes of Dora the Explorer. They first crossed it in the episode The Legend of the Big Red Chicken.