The Gate to Women's Country — Sheri S. Tepper

Since the flames died three hundred years ago, human civilization has evolved into a dual society: Women's Country, where walled towns enclose what's left of past civilization, nurtured by women and a few nonviolent men; and the adjacent garrisons where warrior men live--the lost brothers, sons, and levers of those in Women's Country. Two societies. Two competing dreams. Two ways of life, kept apart by walls stronger than stone.