Where the bend is big and the singers sing loud.

This was the fourth story we shot in the series, On The Trail, for CBS Sunday Morning.  We spent a day south of the border in Boquillas, Couahila MX. 

Over the last few months, there's been a lot of talk about walls on the U.S.-Mexico border. Conor Knighton, "On The Trail" again, as part of "Sunday Morning"'s celebration of the National Park Service's centennial, takes us to Big Bend, the national park along the border whose natural walls are stunning to behold.

A small paddle boat ride is all that seperates tourists from Mexico. 

Boquillas is a tourist town and these are its souvenirs.  

The town bar.

Sunset over The Rio Grande. 

A small slice of water dividing two nations. 

The canyon walls of Big Bend National Park.

The sun being swallowed up by the endless Chihuahuan desert.