The Great Divide is both a hydrologic feature and an intersubjective condition. Geologically, it defines the western and eastern watersheds of North America: water flows east toward the Atlantic Ocean on one side, and west toward the Pacific on the other. Repurposing physical geography to figurative ends raises questions about other divisions: between humans and the natural world, between subjects, and between phases in human life. Where do things end up on either side of a wedge?