A Door Into Ocean: Elysium Cycle Series, Book 1

The Sharers of Shora are a nation of women on a distant moon in the far future who are pacifists, who are highly advanced in biological sciences, and who reproduce by parthenogenesis — because there are no males. Conflict erupts when a neighboring civilization decides to develop their ocean world and sends in an army.

A groundbreaking work both of feminist science fiction and of world-building hard science fiction, A Door Into Ocean is the novel that made Joan Slonczewski's reputation as an important science-fiction writer.