Editing Geography of Guinea-Bissau (section)

== Terrain and ecology ==
[[File:Guinea-Bissau Topography.png|thumb|350px|Guinea-Bissau's topography.]]	

The terrain of Guinea-Bissau is mostly low coastal plain with swamps of [[Guinean mangroves]] rising to [[Guinean forest-savanna mosaic]] in the east.<ref name=fact /> A recent global remote sensing analysis suggested that there were 1,203km² of tidal flats in Guinea-Bissau, making it the 28th ranked country in terms of tidal flat area. <ref>{{cite journal |last1=Murray |first1=N.J. |last2=Phinn |first2=S.R. |last3=DeWitt |first3=M. |last4=Ferrari |first4=R. |last5=Johnston |first5=R. |last6=Lyons |first6=M.B. |last7=Clinton |first7=N. |last8=Thau |first8=D. |last9=Fuller |first9=R.A. |title=The global distribution and trajectory of tidal flats |journal=Nature |date=2019 |volume=565 |issue=7738 |pages=222–225 |doi=10.1038/s41586-018-0805-8 |pmid=30568300 |s2cid=56481043 |url=https://www.nature.com/articles/s41586-018-0805-8}}</ref>

Around 66 million years ago, an asteroid impact occurred 400 km of the west-African coast. The 2022 discovered [[Nadir crater|Nadir buried Crater]] has a diameter of 9 km. The impact caused an earthquake of 6.5 magnitude and created a 1 km high tsunami. The combined forces could be an explanation for the extremely scarred coastline of Guinea-Bissau.

The lowest point on Guinea-Bissau is at sea level at the Atlantic Ocean.<ref name="fact" /> The highest point in Guinea-Bissau is Dongol Ronde with an elevation of {{convert|277|m|ft|abbr=on}}.<ref name="fact" /> ''The Conservation Atlas of Tropical Forests: Africa'' authored in 1992 cites [[Fouta Djallon]] at {{convert|262|m|ft|abbr=on}} as the highest.<ref>{{Cite book |last=Sayer |first=Jeffrey |url=https://books.google.com/books?id=Zv2wCwAAQBAJ&pg=PA200 |title=The Conservation Atlas of Tropical Forests: Africa |date=1992-06-18 |publisher=Springer |isbn=978-1-349-12961-4 |language=en |quote="Fouta Djallon in Guinea, the highest point in Guinea-Bissau being only 262m"}}</ref>

Natural resources found in Guinea-Bissau include fish, [[timber]], [[phosphates]], [[bauxite]], clay, [[granite]], limestone and unexploited deposits of [[petroleum]].<ref name="fact"/> 10.67% of the land is arable and 235.6 square kilometres are irrigated.<ref name="fact"/>

Natural hazards include a hot, dry, dusty [[harmattan]] haze that may reduce visibility during the dry season and brush fires.<ref name="fact"/> Severe environmental issues include [[deforestation]]; [[soil erosion]]; [[overgrazing]] and [[overfishing]].<ref name="fact"/>

Near the Senegal border there have been historic sightings of the [[painted hunting dog]], ''Lycaon pictus'', but that [[endangered]] canid may now be [[Local extinction|extirpated]] in that locale.<ref>C. Michael Hogan. 2009. [https://web.archive.org/web/20101209234758/http://globaltwitcher.auderis.se/artspec_information.asp?thingid=35993 ''Painted Hunting Dog: Lycaon pictus'', GlobalTwitcher.com, ed. N. Stromberg] {{webarchive |url=https://web.archive.org/web/20101209234758/http://globaltwitcher.auderis.se/artspec_information.asp?thingid=35993 |date=December 9, 2010 }}</ref>