Walkthrough for the "Tribes of the East" expansion.

Guys, please help me again. In this mission, after visiting the green player, I need to visit the turquoise one. I built a boat at the shipyard of the former green castle, but I can't pass the area where several galleons, stones, etc. are located, and there's nowhere else to go. If possible, a screenshot would be ideal. I've been trying to complete it for three days now and can't figure it out.