However, the general agreement does not have any relevant substantive and procedural rules governing cooperation between Guinea and Guinea-Bissau.

Hence it has been suggested that recourse should be taken to "The United Nations Convention on the Law of the Non-Navigational Uses of International Watercourses“ which is a global instrument, adopted in 1997, to promote the equitable and sustainable development and management of river basins shared by two or more states.

"[8] It rises near Labe in the Fouta Djallon highlands of Guinea and flows generally in an east–west direction.

[10] Navigation of the Corubal and Geba Rivers also acted as Biofada’s Mandavan caravan routes to carry salt and kola harvest for barter trading for gold, right up to the south of Koya in Cape Mount Area.

At the Saltinho amont station, the mean annual discharge observed during the period was 304 m3/s for a catchment area covering 23,840 km2, over 90% of the entire watershed of the river.

[3] In the lower stretches of the two rivers, the banks have Mangrove forests and marshy lands, which are also infested with anopheles mosquitoes.