Montier-en-Der
Montier-en-Der (French: [mɔ̃tje ɑ̃ dɛʁ]) is a former commune in the Haute-Marne department in north-eastern France. On 1 January 2016, it was merged into the new commune La Porte du Der. The 10th century church of the former Montier-en-Der Abbey has been preserved.