Lighthouse island : a novel / Paulette Jiles.

In the coming centuries the world's population has exploded. The earth is crowded with cities, animals are nearly all extinct, and drought is so widespread that water is rationed. There are no maps, no borders, no numbered years, and no freedom, except for an elite few. It is a harsh world for an orphan like Nadia Stepan. Growing up, she dreams of a green vacation spot called Lighthouse Island, in a place called the Pacific Northwest.