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Mimaropa (usually capitalized in official government documents), formally known as the Southwestern Tagalog Region,[3] is an administrative region in the Philippines. It was also formerly designated as Region IV-B until 2016. It is one of two regions in the country having no land border with another region (the other being Eastern Visayas). The name is an acronym combination of its constituent provinces: Mindoro (divided into Occidental Mindoro and Oriental Mindoro), Marinduque, Romblon and Palawan.
