[Salmoneo]

Another entry in the dying Earth/Sun or Last Civilization approach is The Phoenix in Obsidian aka The Silver Warriors from 1970 by the oft forgotten but quite seminal Micheal Moorcock of Elric fame, but He wrote way more than that. Set in a frozen Earth and with a Sun that is just a white dwarf. The last surviving sea is so salty and dense is gelatinous and ship actually "flap" over it. It's part of the John Daker/Ereköse series, and in turn part of the bigger inter-books Moorcokian Multiverse.

https://en.wikipedia.org/wiki/Michael_Moorcock

https://en.wikipedia.org/wiki/Phoenix_in_Obsidian

[someone7x]

The Ice Schooner as well, but sadly no wikipedia page for it.

> In this far-future adventure, Captain Arflane leads his crew of the schooner Ice Spirit across the endless seas of ice covering Earth. To any survivors of this brave expedition will go the legendary riches buried beneath the ancient ice . . . the once-great city of New York!

https://books.google.com/books/about/The_Ice_Schooner.html?i...