Franz Krause and Mark Harris are the editors of Delta Life: Exploring Dynamic Environments where Rivers Meet the Sea (Open Access).

What is a river delta? There is a popular answer to this question among people who have had geography lessons and seen satellite images of deltas: usually, a delta is the area formed by the sediments of a river as it spills into another waterbody. It often features a fascinating network of meandering channels and distributaries, and its human land uses must adapt to the vagaries of a dynamic terrain characterized by land subsistence, flood risk, rampant erosion and high sediment loads.