When these areas become accessible they can be found on the world map. Look for signs of civil war, darkspawn feeding, and refugees fleeing the carnage of their homelands.
Brothers and Sons
Trigger: Chanter's Board
Map: Battlefield
Description: You come upon the remains of a battlefield.
Actions: Before looting the bodies on a battlefield you have to battle wolves scavenging the corpses. A bear arrives later.
Caravan Down
Trigger: Chanter's Board
Map: Forest Meadow
Description: Coming around the bend, you can see darkspawn looking over their recent kills. It's not until you approach that they notice you and attack.
Actions: Defeat the darkspawn. Bodies to loot at the end.
Desperate Haven
Trigger: Accept the quest from the Chanter's Board in the Denerim Market District.
Map: Abandoned Meadow
Description: You arrive just in time to see some refugees about to be assaulted by a sizable darkspawn force. You must protect the refugees from the darkspawn.
Actions: Saving all or some of the refugees just nets you their thanks.
Jowan's Intention
Trigger: Chanter's Board
Map: Hillside Path
Description: A short reunion with Jowan is interrupted by an attack from Blight-ridden beasts.
Actions: Jowan is trying to protect some refugees; you can work with him to save the innocents. When talking to Jowan, you can choose to put him to death for his crimes; however, the refugees with him won't understand and you will have to beat Jowan and the refugees. Alternately, you don't have to save Jowan or the refugees. The beasts will be fixated on Jowan and the refugees. Let them finish each other off and pick off any remaining beasts.
Loghain's Push
Trigger: Accept the quest from the Chanter's Board in the Denerim Market District.
Map: Forest Outcropping
Description: Loghain's troops are fighting the Bannorn. It's your job to help the Bannorn and kill Loghain's troops.
Actions: Defeat all of Loghain's troops to save the Bannorn troops and complete the quest. You can watch the two sides kill each other completely off as well. The quest is still completed in either case.