Gelding Grotto
Gelding Grotto is a grotto located somewhere in Central Equestria near the Appaloosan Mountains and the city of New Horseleans.
History
Not much of the Grotto is known. It appears to be a reasonably well-known landmark as it appeared on Twilight's map of Equestria.
Behind the scenes
Gelding Grotto first appeared in the semi-canon comic Friendship is Magic #2 in The Return of Queen Chrysalis story arc.