How long is or was the 'Maginot Line'?

The Maginot Line stretched 720 km (450 mi) from the Swiss to the Belgian borders.

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The Maginot Line (French: Ligne Maginot), named after French Minister of Defense André Maginot, was a line of concrete fortifications, tank obstacles, artillery casemates, machine gun posts, and other defenses, which France constructed along its borders with Germany and Italy, in the light of experience from World War I, and in the run-up to World War II. Generally the term describes either the entire system or just the defenses facing Germany, while the Alpine Line is used for the Franco-Italian defenses.

The line stretched from Switzerland to Luxembourg, although a much lighter extension was extended to the Strait of Dover after 1934. The original line construction did not cover the area chosen by the Germans for their first challenge, which was through the Ardennes in 1940, a plan known as Fall Gelb. The location of this attack, probably because of the Maginot line.

There were 45 main forts (grands ouvrages) at 15 kilometres intervals, 97 smaller forts (petits ouvrages) and 352 casemates between, with over 100 kilometres of tunnels.

https://en.wikipedia.org/wiki/Maginot_line

Collier's Magazine reported in 1938:

"When completed, the Maginot Line will form an unbroken chain of fortifications 943 miles long extending from the Alps to the Channel. The 280-mile stretch along the Franco-German border was completed between 1929 and 1936 and represents the most formidable military works ever constructed. The line is being extended north behind the Belgium border and south behind the Swiss border." (The French actually completed the construction as planned.)

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It is a myth however that the Maginot line ended at the Belgian border and was easy to circumvent. The fortifications were connected to the Belgian fortification system, of which the strongest point was Fort Eben-Emael.

https://en.wikipedia.org/wiki/Maginot_Line