Simple: What is the Core Region?

From Fallout PnP

The Core Region is a portion of Fallout Earth that corresponds to the twentieth century’s American west coast and southwest in general. It was the focus of the Fallout computer games and, as such, has much more detail to it than other regions of Fallout Earth. It is the setting with which fans of the computer games are most familiar.

J.E. Sawyer's Simple system
Introduction	What is Fallout? | What is Fallout Earth? | What is the Core Region?
Simple	Simple Overview | Character Creation | Primary Attributes | Secondary Attributes | Derived Attributes Traits | Skills | Perks | Karma and Reputations | Vital Status | Actions | Advancement
Equipment	Survival Gear | Weapons | Ammunition and Fuel | Armor | Chems | Implants | Books | Tools | Vehicles | Workshops
The Fallout World	North America | South America | Europe | Asia | Africa | Australia | Antarctica
The Core Region	Geography | Sites | Organizations | Personalities | Critters