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So I found a place where drowned seem to infinitely Respawn. Handy if you're early in game still, north west of Coast of Wrecks, or WSWest from Hangman's Alley, on the top
GameBanshee
W3EE - Coast of Wrecks fix at The Witcher 3 Nexus - Mods and community
The Witcher 3 - 104 Hidden Treasure Coast of Wrecks - YouTube
Queen Zuleyka's Treasure Walkthrough | The Witcher 3|Game8