Carentan-les-Marais is located in the middle of vast marsh remediated and transformed into rich meadows, at the confluence of the Taute and the Douve. The city, at the gateway to the Cotentin Peninsula and the Bay of Veys, is at the heart of the Regional Natural Park of the Cotentin and Bessin marshes.
Transport
The city has a railway station on the Paris–Cherbourg line and is crossed by the RN 13 and RN 174. It is served by public transport by bus (Manéo) via the line 001 Cherbourg-Octeville - Valognes - Carentan - Saint-Lo. Its port is connected to the sea by a canal.
Toponymy
The name of the commune refers to the marshes of Carentan.