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General levelling of France

Coordinates: 43°16′42″N 5°21′12″E / 43.27833°N 5.35333°E

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The General Levelling of France (nivellement général de la France or NGF) forms a network of benchmarks in mainland France and Corsica, now overseen by the Institut Géographique National. It is now the official levelling network in mainland France. It is made up of two networks:

NGF - IGN69 for mainland France, with the 'zero level' determined by the tide gauge at Marseille
NGF - IGN78 for Corsica, with the 'zero level' determined by the tide gauge at Ajaccio

43°16′42″N 5°21′12″E / 43.27833°N 5.35333°E / 43.27833; 5.35333

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