Fréthun (French pronunciation: [fʁetœ̃]; West Flemish: Fraaituin) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France[3] 3 miles (5 km) southwest of Calais.

It is home to the Calais-Fréthun railway station and the Eurotunnel terminal, linking France with England.

The inhabitants are called Fréthunois.

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