100% Hollow Grove

[Helis]

Hey.
Going for 100% map, but I'm stuck at 99% in the Hollow Grove. Could someone please tell me how to open this thing?
http://images.akamai.steamusercontent.com/ugc/262709655611296077/DADF03FB493F92A9B38C28419E15119EB12C53EE/
I tried going from behind (through the Moon Grotto, I suppose), but there I meet this:
http://images.akamai.steamusercontent.com/ugc/262709655611295722/66CEEF732EC82B0D0982ABF35B3AFB55DE8DE049/
and there's no way I can go up.

[SonicDen220]

One of the platforms where you cross the water is stompable. It's really easy to distinguish.

[Helis]

Oh, indeed. Thank you!