El Agujero is a guerrilla hideout on El Este's north-east coast, close to the town of Concepción. Unlock it to get a fast travel point and a workbench in that corner of the map.
Like the other hideouts, El Agujero is a small safe spot. You can change gear at the workbench and send Los Bandidos out from the board. The grill cooks meals for a short buff.
Build the Hideout Network at a guerrilla camp's construction desk. That reveals hideouts you can then travel to. Higher network tiers give each hideout a supply cache and a parked vehicle.
The north-east coast is a long drive from most of El Este. Having El Agujero unlocked saves a lot of time when you chase objectives near Concepción.
Concepción
Concepción is the biggest city in El Este and the hidden home of La Moral's headquarters. It is busy by day, but a strict curfew turns it into a restricted area at night.
Maldito
Maldito is a small town in Conuco, the central province of El Este. It sits close to Schaub Pass, so you will often drive through it on the way across the region.
Anti-Aircraft Site Chi
Anti-Aircraft Site Chi is an FND flak post in El Este. Wreck the gun to fly safely over this part of El Este and pick up the Depleted Uranium stored at the site.
Anti-Aircraft Site Lambda
Anti-Aircraft Site Lambda is an FND flak post in Sierra Perdida, El Este. It is out on the Lágrimas Islands, so plan a boat trip rather than a flight to reach it. Destroying it also gets you Depleted Uranium.