Where to Find Crookback Bog?

Crookback Bog is a large swamp area in southern Velen.

How do I get the return to Crookback bog quest?

Head to the villlage of Downwarren and talk to the Bloody Baron. Follow the Bloody Baron. If you walk too far away from the Bloody Baron, the quest will fail.

Where is the baron's wife Witcher 3?

SECONDARY QUEST

Before proceeding in Family Matters Geralt must find the Baron's wife Anna, which can only be done by completing the quests Hunting a Witch, Wandering in the Dark and Ladies of the Wood.