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The Sesia (Latin Sesites or Sessites) is a river in north-western Italy, tributary to the Po.

Sésia was a department of the French Consulate and of the First French Empire in present-day Italy. It was named after the Sesia river. It was formed in 1802, when the Subalpine Republic (formerly the mainland portion of the Kingdom of Sardinia) was directly annexed to France. Its capital was Vercelli.