Philippe Buache (born La Neuville-au-Pont, 7 February 1700; died Paris, 24 January 1773) was a French geographer, known for inventing a new system of geography and popularizing this field.^[1]

Buache was trained under the geographer Guillaume Delisle, whose daughter he married, and whom he succeeded in the Académie des sciences in 1730.^[1]

Buache was nominated first geographer of the king in 1729. He established the division of the world by seas and river systems. He believed in a southern continent, an hypothesis which was confirmed by later discoveries. In 1754, he published an "Atlas physique." He also wrote several pamphlets.

His nephew, Jean Nicolas Buache (born La Neuville-au-Pont, 15 February 1741; died Paris, 21 November 1825), was also a geographer of the king.

• Considérations géographiques et physiques sur les découvertes nouvelles dans la grande mer (Paris, 1754). This contains a chart of the western coast of North America.
• Le parallèle des fleuves des quatre parties du monde pour servir a déterminer la hauteur des montagnes (1757)
• Mémoire sur la traversée de la mer glaciale arctique (1759). This contains his hypothesis of an Alaskan peninsula.
• Considérations géographiques sur les terres australes et antarctiques (1761)

• Sea of the West

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• The French West Indies Collection, including geographical writings of cartographer Philippe Buache, are available for research use at the Historical Society of Pennsylvania.

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