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A core provinces of a country is a province that is viewed internationally as a legitimate claim of that country. For example Canada's core provinces are Quebec and Ontario.
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Region 7 or the Central Visayas region, has four provinces, namely: Cebu, Bohol, Negros Oriental and Siquijor.
Region 2 in the Philippines consists of the provinces of Batanes, Cagayan, Isabela, Nueva Vizcaya, and Quirino.
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The provinces in region 6 (Western Visayas) are Aklan, Antique, Capiz, Guimaras, Iloilo, and Negros Occidental.
The provinces in Region 1 of the Philippines are Ilocos Norte, Ilocos Sur, La Union, and Pangasinan.
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The provinces of Region 3 in the Philippines are Aurora, Bataan, Bulacan, Nueva Ecija, Pampanga, Tarlac, and Zambales.
The core provinces of Canada, which include Ontario and Quebec, feature a varied landscape of landforms. This region contains the Canadian Shield, a large plateau of exposed Precambrian rock, as well as the Great Lakes, the St. Lawrence River, and the Niagara Escarpment. The landscape also includes rolling hills, forests, and fertile farmland.