Final answer:
The Red River Plains area along the Texas border in Southeastern Oklahoma has varying elevations.
Step-by-step explanation:
The Red River Plains area, which runs along the Texas border in Southeastern Oklahoma, has varying elevations. The elevations in this area are represented by the shaded relief map of Texas in Figure 1.11.
The red and white colors on the map represent high elevations, while the greens and yellows represent lower elevations. The map scale reference is 30° latitude.
For example, the elevations in the Red River Plains area can range from -105° to -100° based on the map.