Eyla Tarn

Eyla Tarn is a shipwreck in Chapter 2. It lies near Baltimore's workshop, far behind troll's lair. In the wreck, there is a chest containing Journal from the Eyla Tarn, Vran armor enhancement and some crafting components. Earning the journal will complete Mystic River quest.

Iorveth's path
You can find the shipwreck always. Instead of Roche's path, there is no mist blocking you.

Roche's path
You can find the wreck, and she-troll during your trip to Vergen during The Blood Curse (not tested) or during The Siege of Vergen. NOTE: The She-troll can be found only when you go with Roche.