The Rio Grande enters a limestone wall here and comes out the other side 8 miles later having cut a slot up to 1,500 feet deep and in places barely 30 feet wide. The rock is the same Cretaceous limestone that forms the Edwards Plateau, lifted here into the Mesa de Anguila block along a fault; the river was already running its course when the block began to rise, and it cut down as fast as the land came up rather than being diverted around it. The far wall is Mexico.
Getting there
29.1660, -103.6120
Locations are approximate and may be inaccurate, on private land, or otherwise inaccessible. Check before you travel.
Hear it from the road
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