Spoil islands are overlooked places combining dirt with paradise, waste-land with "brave new world," and wildness with human intervention.Mundane products of dredging, these islands form an uninvestigated archipelago that demonstrates the potential value and contested re-valuation of landscapes of waste. Research navigates the U.S. east coast from New York City to Key West, examines these marginalized topographies to understand emergent concerns of 21st-century placemaking, public space, and infrastructure, and discovers that spoil islands constitute an unprecedented public commons, where human agency and nature are inextricably linked.