The Gate to Women’s Country by Sheri Tepper 1988 (315 pgs)
Compelling post-apocalyptic tale of a society that becomes gender-segregated. After their world was devastated by wars, the culture eventually evolved into one of matriarchal semi-dictatorship. The men live in garrisons outside the cities walls, the women inside. The two groups meet only at festival times and are otherwise two very separate secretive societies. Tepper deftly explores themes of gender inequality and humankind’s propencity for self-distruction.