This place has a natural stone bridge that one can walk over to the other side. It holds the gab between a very long drop. Cera mentions once that it'll take most of the day to get there so it must not be near by. One is also visible in the 8th movie towards the end and it's near a natural hot spring(s) that Littlefoot and his friends find with Mr. Thicknose.
It is clear somehow, not among the producer and director that the bridge could be seen again in the twentith episode of the LBT called 'The Big Longneck Test' because Shorty, a returning character from the tenth film of the LBT took Littlefoot's friends ( Cera, Chomper, Ducky, Ruby, Petrie and Spike) over to that walkover which Shorty survived a nasty fall when one part of the bridge collapsed while Littlefoot is with Bron, another returning character from the same film, Shorty was in, doing a test ( which Shorty was lying about him already doing it but didn't do it).
The Great Stone Walkover appeared in two major parts: one, the LBT film 'The Big Freeze' which it is clearly visible towards the end of the film and it is near a natural place as Littlefoot, Cera, Ducky, Spike and Petrie are finding Mr. Thicknose. For number two, it's in the twentith episode of the LBT called 'The Big Longneck Test' where Shorty and Littlefoot's friends are going on the other side of the valley also it was clear somehow but not for both the producer and director of the episode.
The Big Longneck Test episode is the twentith one in the television show between the nineteenth episode 'The Amazing Threehorn Girl' and the twenty - first one called 'The Hermit of Black Rock'.