At 36,125 square kilometres (13,948 sq mi), the country is larger in size than Taiwan or Belgium. Guinea-Bissau lies at a low altitude; its highest point is 300 metres (984 ft).
The terrain of Guinea-Bissau is mostly low coastal plain with swamps of Guinean mangroves rising to Guinean forest-savanna mosaic in the east. Its monsoon-like rainy season alternates with periods of hot, dry harmattan winds blowing from the Sahara. The Bijagos Archipelago lies off of the mainland.
The lowest point on Guinea-Bissau is at sea level at the Atlantic Ocean.The highest point on Guinea-Bissau is 300 metres above sea level at an unnamed location in the northeast corner of the country.
Natural resources found in Guinea-Bissau include fish, timber, phosphates, bauxite, clay, granite, limestone and unexploited deposits of petroleum. 10.67% of the land is arable and 235.6 square kilometres is irrigated.
Natural hazards include a hot, dry, dusty harmattan haze that may reduce visibility during the dry season and brush fires. Severe environmental issues include deforestation; soil erosion; overgrazing and overfishing.
Near the Senegal border there have been historic sightings of the Painted Hunting Dog, Lycaon pictus, but that endangered canid may now be extirpated in that locale.