Where is the Sierra Madre Oriental located in Mexico?

The Sierra Madre Oriental is a mountain range located in eastern Mexico, where it runs parallel to the coast of the Gulf of Mexico.2

Situated on the eastern side of the Mexican Plateau, the range extends approximately 700 miles (1,100 km) from north to south. It begins southeast of the Big Bend of the Rio Grande and continues until it merges with the Cordillera Neo-Volcánica at the southern edge of the Mesa Central.123