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Map of the Philippines showing the location of Cagayan
The provincial flag of Cagayan
The provincial seal of Cagayan

Cagayan (Ilocano: Probinsia ti Cagayan; Ibanag: Provinsiya na Cagayan; Itawit: Provinsiya ya Cagayan; Tagalog: Lalawigan ng Cagayan) is a province of the Philippines in the Cagayan Valley region in the northeast of Luzon Island, and includes the Babuyan Islands to the north. The capital is Tuguegarao.