Biombo is a region in western Guinea-Bissau, with an area of 840 km² and its capital is Quinhámel. There has not been any local administration …Biombo is a region in western Guinea-Bissau, with an area of 840 km² and its capital is Quinhámel. There has not been any local administration since the civil war of 1998-99, and all the social services are done by organs of civil society and other government agencies. It is a coastal region covered with Mangrove swamps, rain forest, tangled forest, and receives an annual rainfall of more than 1,000 mm.