before the image add this text: [ SPOILER] after the image add this text: [ /SPOILER] Just make sure that there's no space inside the []
I'm not sure what the point of this post is? It takes a lot less time to follow the lighter-colored water than the one you've highlighted...
Now that my boat is free I can illustrate: Spoiler Following shallower water only takes 12.5 hours: Whereas your path takes 18 hours (plus 3.5 hours of battles in my case):