Title: Séré de Rivières system
Content:  was a simplified polygon, surrounded by a ditch that was covered by caponiers. The forts, built in masonry and shaped stone, were designed to shelter their garrison against bombardment and artillery was laid out on top of the fort in the open. A feature of the new system involved the construction of two defensive curtains, an outer line of forts, backed by an inner ring or line of forts d’arrêt at critical points of terrain or junctions, along with a great number of coastal batteries. Examples of the first sort may be found at Verdun, Toul, Épinal, Belfort in the north-east as well as Paris and Brest. Forts d'arrêts may be found at Manonviller, (Meurthe-et-Moselle) and Bourlémont (Vosges).
Title: Italian invasion of France
Content:  During the 1930s, the French had constructed a series of fortifications—the Maginot Line—along their border with Germany. This line had been designed to deter a German invasion across the Franco-German border and funnel an attack into Belgium, which could then be met by the best divisions of the French Army. Thus, any future war would take place outside of French territory avoiding a repeat of the First World War. In addition to this force, the French had constructed a series of fortifications known as Alpine Line, or the Little Maginot Line. In contrast to the Maginot Line facing the German border, the fortifications in the Alps were not a continuous chain of forts. In the Fortified Sector of the Dauphiné, several 
Title: Battle of the Trouée de Charmes
Content:  From 1874 to 1880, General Raymond Adolphe Séré de Rivières oversaw the construction of the Séré de Rivières system, a line of fortresses 65 km long from Belfort to Épinal and another line 65 km long from Toul to Verdun, about 40 km from the Franco–German border. The river Meuse flows northwards from Toul to Verdun, Mézières and Givet on the Belgian border and there is a tributary of the Moselle between Belfort and Épinal, the rivers running near parallel to the 1871–1919 Franco–German border. A 70 km wide interruption in the French fortifications was left between Épinal and Toul, known as the Trouée de Charmes (Charmes Gap), which was west of Nancy, about 12 km from the Franco-German frontier. A second series of fortifications, to prevent the main line being outflanked, was built in the south from Langres to Dijon and in the north from La Fère to Rheims, then from Valenciennes to Maubeuge, although for financial reasons these took until 1914 to complete.
Title: Fortified region of Belfort
Content:  The fortified region of Belfort (place fortifiée de Belfort) formed the first line of defense in the Séré de Rivières system of fortifications in the Belfort Gap. Located in northeastern France between Épinal and Besançon, the primary line was built in the late 19th century to deal with advances in artillery that had made older defensive systems obsolete.
Title: Fortified Sector of Flanders
Content:  The Fortified Sector of Flanders (Secteur Fortifié des Flandres) was the French military organization that in 1940 controlled the section of the French border with Belgium between Lille and the North Sea. The sector was part of a system of fortifications that, in other sectors, included the Maginot Line. In the case of the Flanders sector, no large fortifications of the kind typified by the Maginot Line were built in the area. Fortifications were confined to almost two hundred blockhouses built during the 1930s, and some defensive inundations in the vicinity of Dunkirk. The Fortified Sector of Flanders was bordered on the east by the Fortified Sector of Lille It was quickly overrun by German forces during the Battle of France.
Title: Plan XVII
Content:  12 km from the German frontier. A second series of fortifications, to prevent the main line being outflanked, was built in the south, from Langres to Dijon and in the north from La Fère to Rheims and from Valenciennes to Maubeuge, although for financial reasons these defences were incomplete in 1914. During the 1870s, the French army drew up concentration plans according to a defensive strategy, which exploited the Meuse and branches of the Moselle parallel to the 1871 border. The completion of the fortress lines between Belfort and Verdun in the late 1880s and railway building from the interior to the border, then gave the French army the 
Title: Fortified region of Belfort
Content:  defenses that would prevent an enemy from penetrating French territory. The second part of the recommendation was to involve the creation of fortified regions (regions fortifiés) in which an enemy could be confronted. The initially recommended fortified regions included: The regions were to provide locations in which to confront an enemy and from which to launch an offensive to carry the battle onto enemy territory. The previous fortifications of the Séré de Rivières system of the 1880s were designed to defend the frontiers of France that existed following the Franco-Prussian War, in which France had lost Alsace and Lorraine. With the recovery of these territories following World War I, most of the Séré de Rivières forts were deep in the interior 
Title: Fort de Queuleu
Content:  The fort was one of the first built according to the fortification system developed by Lieutenant Colonel Raymond Adolphe Séré de Rivières. The goal was to build a discontinuous enclosure around Metz using a series of artillery forts spaced a cannonshot apart. In the 1860s tension was rising between France and Germany, causing France to attend to the fortification of its frontiers. Metz, close to the border and a strategic road and rail crossing, was the beneficiary of one of the first programs of fortification. Before all of the forts could be completed, France was defeated in the Franco-Prussian War and the area around 
Title: Meuse-Line
Content:  The Meuse-Line is the chain of French forts and other military installations closing the passages of the Meuse between Verdun and Toul. These lines formed part of the defensive scheme adopted by France in 1873–1875. The total length of the line was 31 m, and the forts d'arrêt are disposed along the right bank. The forts are: between Verdun and Saint-Mihiel, Génicourt-sur-Meuse and Troyon; near Saint-Mihiel, Les Paroches (left bank) and Camp des Remains; and near Commercy, Liouville-Saint-Agnant, Gironville-sous-les-Côtes and Jouy-sous-les-Côtes. Above the circle of the Toul defences there are barrier forts on the Upper Meuse at Pagny (la-Blanche-Cote) and near Neufchâteau; but these last are practically in second line, and between Toul and Épinal the frontier districts are designedly left open. At Épinal the Moselle-Line begins.
Title: Fortified Sector of Lille
Content:  The Fortified Sector of Lille (Secteur Fortifié de Lille) was the French military organization that in 1940 controlled the section of the French border with Belgium opposite Lille. The sector was part of a system of fortifications that included the Maginot Line in other sectors. In the case of the Lille sector, no large fortifications of the kind typified by the Maginot Line were built in the area. Fortifications were confined to a total of 65 blockhouses and 23 infantry shelters within a few kilometers of the border, mainly between Roubaix and Tourcoing and the border. The Fortified Sector of Lille was bordered on the east by the Fortified Sector of the Escaut and on the west by the Fortified Sector of Flanders. The sector figured in the Pillbox affair of 1939-40. It was quickly overrun by German forces during the Battle of France.

Question: a system of fortifications along france's border?
Answer: Maginot Line.
The Maginot Line.