Fort Joy Island seems more tropical to me based on the vegetation and even the sand and water.
The sand has a warm and yellowish color.
The Water is pretty clear and light blue, which also indicates a tropical climate.
Carribean Islands are a good example.
I grew up near the seaside: it had the most gorgeous golden sand, and often really bright and hot sun: I remember the latter, because my skin got really badly flayed by sunburn in my youth. But this was facing the North Sea which was absolutely bloody freezing. Didn't stop me swimming in it, but I was young and foolish! And the most wonderful aquamarine sea I've ever seen was off the north coast of Scotland. Looks can be deceiving...
I once said that Larian's process for establishing the lore of their next Divinity game seems to be that everyone is given a quiz covering established facts and information from previous games in the Divinity series, and whoever gets the most answers WRONG is put in charge of writing the lore for the new game.
Trying to work out a map from that is like trying to glue back together a vase using pieces of 18 different vases of varying sizes, shapes, and designs. And also a lot of the pieces from the vase you actually are trying to glue together have been removed from the pile.
It does seem a bit like that sometimes. I've also attempted to map other areas based on literature with varying degrees of success (admittedly varying between "none" and "little" most of the time...)
