World map coloured of green, yellow, blue and red for illustrate the four color theorem. This map, unlike File:Four color world map.svg, considers lakes and ocean. That is why Malawi (with a uneven number of neighbor countries) is in dark purple: Tanzania, Mozambique and Zambia cannot be in the same color.
Own work, based on File:BlankMap-World6, compact.svg, uploaded by Lokal_Profil.
XalD