Val-de-Marne is a department of France located in the Île-de-France region. Named after the river Marne, it is situated in the Grand Paris …Val-de-Marne is a department of France located in the Île-de-France region. Named after the river Marne, it is situated in the Grand Paris metropolis to the southeast of the City of Paris. In 2019, Val-de-Marne had a population of 1,407,124.