The most likely place for a new Isles language would surely be somewhere in the eastern half of the Ttiruku island arc. Ttiruku itself is supposed to be a hotbed of linguistic diversity, but the only language there that we know so far is Pparwak. There could easily be a second branch of Isles there, and there's also LOTS of room for unrelated contact languages. (We also know that there is at least one descendant of Proto-Mbingmik supposed to be spoken on the island, but no such language has been described so far.) There's also another fairly large island immediately west of Ttiruku, the linguistic landscape of which is still completely undescribed.
If you really want to go further afield, having a look at suggests a few other places that should be relatively easy to reach from the Proto-Isles homeland on the southwestern tip of Tuysáfa:
- following the warm red current a bit eastward along the mountaineous southern coast of Tuysáfa, in a region where several yet unknown Mbingmik languages are spoken, as well as a couple of unrelated languages.
- following the cold blue current to the tropical west coast of Zeluzhia, south of the area where Zeluzh is spoken. Nothing about the languages in this region has been worked out so far.
- starting from the western half of the Ttiruku arc, westwards across the bay of Kasca towards Mrisaŋfa, the homeland of the Peninsular languages. Here you'd have several known contact languages to borrow from.
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