Terre-et-Marais (, literally Land and Marsh) is a commune in the department of Manche, in northwestern France.
The commune's name refers to the marshes of Carentan.
The municipality was established on 1 January 2016, through the merger of the former communes of Sainteny (the seat) and Saint-Georges-de-Bohon. The communes of Saint-Georges-de-Bohon and Sainteny became delegated communes.