That is because it is NOT. I screwed up there by assuming it was the Rio Grande River. The RGR cannot even be seen anywhere in the park, even though the Rio Grande Trail gets very close to it. But the brush is so thick in that area there is no reasonable way to get close enough to see the Rio Grande River.Interesting and different view of the Rio Grande river, I'm not used to seeing it like in your photo.
This "river" below is really the La Parida Banco. And both sides are in the USA. It's not a river at all, but a lake in a backwards "C" shape when I check my maps.
But I did go the real Rio Grande River. It's at the end of the Chimney RV Park a few miles from here.
Here are photos of the real true, no doubt, Rio Grande River with Mexico half way across the river:
-Don- Mission, TX