Board Thread:Questions and Answers/@comment-98.141.47.111-20140113121113/@comment-5411265-20150130081248

Yes, it's very interesting! Rowan of Rin is also confirmed in The Golden Door: "You’re mad if you believe sailors’ tales. They’ll tell you about sunken singing islands, and people that are half fish, and dragons that speak, and great ghost bells that ring when death approaches a ship …they’ll tell you anything!"

The 'half fish' refers to the Maris people in Rowan of Rin. It's very cool!