Oerik is the largest continent on the world of Oerth, where the Greyhawk campaign takes place.
Oerik is named after the Oeridians, a human people who settled much of the continent. The best-known part of Oerik is the eastern portion, known as the Flanaess, named after the first human settlers to that region, the Flan.
A lesser-known region, Western Oerik, was described in materials for the Chainmail game from 2001-2002.
- Cook, David. "History of the Greyhawk Wars." Wars. Lake Geneva, WI: TSR, 1991. Available Online: 
- Gygax, Gary. The World of Greyhawk. Lake Geneva, WI: TSR, 1980.
- -----. World of Greyhawk Fantasy Game Setting. Lake Geneva, WI: TSR, 1983.
- Holian, Gary, Erik Mona, Sean K. Reynolds, and Frederick Weining. Living Greyhawk Gazetteer. Renton, WA: Wizards of the Coast, 2000.