Originally posted by knighttemplar1960:

Originally posted by Servant of Seraph:

They DO NOT spawn near the starting island. Theres a video on YT that goes into detail about this and shows the perimeter at which they start spawning. Research it 😎😇

Actually they can. The OP had a huge start island 2/3rds the way around it in 6 days of sailing. If you are more than 500 meters from the starting stones and you enter ocean or sail at night near the shore a sea serpent can spawn.