What geographical feature do the Cross Timbers represent?

The Cross Timbers is a distinctive ecological area that serves as a boundary between the eastern forests and the western prairies of Oklahoma. This geographical feature consists of a mix of trees and grasslands, showcasing a transition from the lush, wooded landscapes typical of the eastern part of the state to the more open, grass-dominated ecosystems found in the west.

This transition in vegetation is significant as it demonstrates the diverse ecological zones present in Oklahoma, shaped by factors such as climate and soil type. The Cross Timbers includes flora and fauna unique to both regions, making it a critical area for biodiversity.

In contrast, the other choices reflect different kinds of geographical features or boundaries that do not accurately describe the Cross Timbers. Understanding the significance of this area is essential for grasping the complexity of Oklahoma's natural landscape and its ecological diversity.