Prerequisite: None | Suggested Level: N/A
There's a Hidden Treasure, an Undiscovered Location, on the peninsula south of Oxenfurt. Check it to find a corpse, then loot and read the letter it's holding. It'll tell you of some loot just to the east. Head to the new marker, take out the Drowners in the area, and loot the chest they were guarding to wrap this quest up quickly.
Prerequisite: None | Suggested Level: 32
Head for the archipelago northwest of Oxenfurt to find a Hidden Treasure marked as an undiscovered location. Loot the corpse here to find a key and a letter. Read the letter to create a search area on your map, but watch out - a basilisk will also fly in for battle. Slay it, then use your Witcher Senses to locate a locked chest. Open it with the key you just found to find some sweet loot inside.
Prerequisite: None | Suggested Level: 18
There's another Hidden Treasure just northwest of the last one. You'll find a corpse with a key and a bloodstained note. Loot and read the note to place a search area on the map. Use your Witcher Senses to find a locked chest under a wooden structure, then use your newfound key to get the goodies inside.
Contract: Patrol Gone Missing
Prerequisite: None | Suggested Level: 7
You can get this contract from the Notice Board in the Nilfaardian Army Group 'Center' Camp (it's in the southeast corner of the map). Once you've grabbed it, speak to Quartermaster Eggebracht in a nearby tent to learn more about the patrol that's disappeared.
Head to your new marker in the swamp to the north to find an abandoned camp site. Use your Witcher Senses to detect some footprints, then follow these until you encounter a Wyvern - there will be some wolves and a dead body along the way. Slay the Wyvern, loot its corpse, and return to the quartermaster for your reward.
Prerequisite: None | Suggested Level: 12
There's a Nilfaardian noblewoman just north of the camp with a quest for you: her son has gone missing. To start your search, head into the camp and speak to the quartermaster marked on your map.