Auflance is located on the frontier of Belgium along its eastern border some 38 km east by south-east of Sedan and 17 km north-west of Montmédy. Access to the commune is by the D17 road from Puilly-et-Charbeaux in the north-west which passes through the centre of the commune and the village and continues to Sapogne-sur-Marche in the south-east. A small country road crosses the Belgian border and goes to Villers-Devant-Orval. The commune is mixed forest and farmland.
The Marche river forms the south-eastern border of the commune as it flows south-west to join the Chiers near Margut. The Paquis river passes through the centre of the commune from north-west to south-east where it joins the Marche on the border of the commune. The Coquerte flows from the north in the west to the commune to join the Paquis.
In 2010 the commune had 85 inhabitants. The evolution of the number of inhabitants is known from the population censuses conducted in the commune since 1793. From the 21st century, a census of communes with fewer than 10,000 inhabitants is held every five years, unlike larger towns that have a sample survey every year.[Note 1]
The Chateau of Auflance (17th century) is registered as a historical monument. In the 17th century the Custine family came to settle in this border commune. They built a castle of which only a few vestiges remain: a round tower, underground tunnels, and a remarkable Renaissance door decorated with coats of arms and surmounted by a Pietà.
In the Church the Funeral Chapel of the Custines has a hallway decorated with coats of arms which were made during the French Revolution
The Saints of Auflance Chapel from the 13th century has 13 statues which have been stored out of fear of theft. These statues of the Saints of Auflance are registered as historical objects.
^At the beginning of the 21st century, the methods of identification have been modified by Law No. 2002-276 of 27 February 2002, the so-called "law of local democracy" and in particular Title V "census operations" allows, after a transitional period running from 2004 to 2008, the annual publication of the legal population of the different French administrative districts. For communes with a population greater than 10,000 inhabitants, a sample survey is conducted annually, the entire territory of these communes is taken into account at the end of the period of five years. The first "legal population" after 1999 under this new law came into force on 1 January 2009 and was based on the census of 2006.