Large creek-small river with high flow that disappears into the stream bed. The stream bed continues on to where it joins the White river and runs only during flood stage.
The underground river goes a different direction and joins the White river far upstream of the mouth as Big Spring-Cotter Springs.
The Rio Grande river becomes a underground river downstream from El Paso. Very popular place for the illegals and drug smugglers to enter Texas.
I read the Rio Grande peters out because all the water gets tapped off.
Just like the Colorado River.
Or for that matter the whole freakin’ Nile.