Two stamps with the same design were issued in 1970 by Guinea. The
design shows a map of Africa with four countries shaded in color:
Mali-green, Mauritania-blue, Senegal-yellow and Guinea-red. The stamps
commemorate the meeting of representatives of the countries bordering
on the Senegal river, the OERS,
Orgaisation Etats Riverains du Senegal.
The Senegal River is the second longest river
in West Africa. The river basin has a sub-Saharan desert climate
which was aggravated in the 1970s by long periods of drought. The map
shows the four countries involved in the development of the Senegal
River, but it does not show the river itself.