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Start from the Toadstool Mire by gliding south then east, progressively higher with a series of updrafts, then running higher, through an archway, and one last easy glide northeast.
Additionally, you can also get there by land with one small glide at the end. From Blighted Bog, head roughly east, meandering north and south, jumping up at every opportunity. Eventually, you will be on a ledge within bowshot range of another ledge. This second ledge is the POI location, so just glide there.