Martinez's Camp, also known as the River Camp, is a campsite located within rural Georgia on an open field. It first appears in "Dead Weight". It is a camp containing over 30 survivors and was led by Martinez, before being briefly succeeded by Pete Dolgen and then by Philip Blake.
At some point following Martinez's abandonment of the Governor, he gradually gathered a group of survivors and set up camp on an open field. Over time, more survivors came along and set up RVs and other vehicles for the dual purpose of housing as well as a defensive perimeter against walkers. They also dug several pits to catch approaching walkers.
Philip, under the guise of "Brian", goes out with Martinez in the group to scavenge. Later on, he brutally murders all the "leaders" to be in charge, Martinez getting a golf club to the face and thrown in a walker pit, Pete Dolgen getting stabbed, and Pete's brother Mitch getting threatened. The Governor then makes a speech about taking over the prison.
The Governor gives a speech to the majority of the camp survivors about the prison and its inhabitants, persuading them to force the prison residents to give up the prison. While several children, elderly, and women stay behind at a camp set up by the river, the Governor and his army (consisting of Mitch, Alisha, Tara, and 22 others) approach the prison with Hershel Greene and Michonne Hawthorne held hostage. After Hershel is executed, the Governor's soldiers attack, mowing down the fences and firing the tank's shells at the prison. They manage to kill a few prison survivors, including Julio, before they are killed by the prison defenders and the swarming zombies.