The area where General Elias chases the Glanton gang out of Mexico

This is where the Story ends as The Kid is introduced as The Man, and he meets with Judge Holden one last time.

Where The Kid is arrested for two years after the Glanton Gang's massacre.

This is the location where the Glanton Gang controls a River Ferry, robbing and killing those who take it. The gang also sets their base here. 

Where the Glanton Gang Regroups after being hunted by the Mexican Army

The Glanton Gang at this point had discovered and massacred a group of Gilenos (Apache Native Americans in the eastern Chihuahua Area) this occurs at a lake at this location

This area is likely where the Glanton Gang first Encountered the Apache Native Americans 

The book tells that The Kid was born and raised in a poor rural home in Tennessee, not very specific as to where the home is in Tennessee.