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That's the area a bit before the multiple falls by the look of it, but the waterfall seems to be blocked by rocks. It seems weird that it'd just be an area to itself, and Lana is on the beach below for her challenge. It'd also be weird if you'd have to go all the way around for that as well. Either something climbed another climbable waterfall, or maybe the player enters from the side. It'd be weird to detail that many waterfalls without waterfall, but there was that one town in Kalos that was all about watefalls with only about two usages of the moon for a tm.