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Road Trip pic of the day, 7/30: What is this?

Big rock formations have been a Road Trip picture of the day challenge fixture. So why not do one more? If you're the first to tell me what and where this is, you'll win a prize.

Do you know what this is? If so, you could win a prize in the Road Trip picture of the day challenge. Daniel Terdiman/CNET

If you've followed the Road Trip picture of the day challenges, you may have noticed that a number of them have featured big rock formations. And why not? When you drive more than 5,000 miles through states like Colorado, Utah, Idaho, Montana, and Wyoming, as I did during Road Trip 2009, you see some of the most beautiful things nature can throw at you.

But this is the penultimate daily challenge, so I figured, why not dip into the well once more and task you with identifying one last wondrous piece of nature?

To that end, if you are the first to tell me (by e-mail to daniel--dot--terdiman--at--cnet--dot--com) what this is called, and where it is, you'll win a prize.

After tomorrow, however, there won't be any more daily challenges. Until Road Trip 2010, that is.

So good luck.

Click here for the entire Road Trip 2009 package.