Longue Durée, or long term, is an approach to history writing pioneered by historians of the Annales school such as Fernand Braudel. It focusses on events that occur nearly imperceptibly over a long period of time, on slowly changing relationships between people and the world. It relies on disciplines such as climatology, demography and physical geography. This is opposed to event-based history that is limited to short-term perceptible events.
An example would be a study of the Indian population and its density based on the evolution of river basins over a long period of time in the country.