Early in my explorations I came across a cave that required two dragon claws, only one of which was onsite. I have the other one now but don't remember where the cave was.

You enter at the bottom of a big column of open space with a pillar in the middle, where resided a claw and a message about it. There was also a chest in view that I couldn't reach with level 1 of Whirlwind Sprint.

Can anyone tell me the name of this cave? Thanks!

is it reachwater rock?

The only one I can think of is Reachwater Rock

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Yep Reachwater Rock was it. Thanks.