Keiem is a small town situated some 7 km north of Diksmuide in West Flanders, Belgium. Administratively it forms part of Diksmuide Municipality. Lying close to the right bank of the River Yser, the town suffered extensive flooding when, on 21 October 1914, the sea locks at the mouth of this river were opened as a defensive measure against the advancing German Army during the "Race to the Sea" phase of World War I.