Unless it has an outlet, it's not going to be freshwater -- and maybe even if it has one. Yeah, if there's even just pack ice there much of the year, it would be not so useful for navigation. It would be interesting though if it were a broad enough strait to leak bergs into the Maixen.

Most of those rivers are fine. The delta at Paridaniton is a little iffy - that's not a big enough watershed upstream to generate lots of sediment. But hey - maybe the elevation of its headwaters is geologically young, and the Thandawenne is eroding like crazy <shrug>. T'were it my continent I'd probably give more of those dead- end lakes outlets to the sea.

It looks nice - I like crisp & sharp over gradients & shading, lotsa times.