Related by context. Frequent words. (Click for all words.) 61 Kaduna Kano 59 Kano Kaduna 53 Togo Benin 52 Burkina Faso Niger 52 Mali Burkina Faso 50 Albertine Graben 50 Egbema 50 Mauritania Niger 49 Raton Basin 49 Niger Senegal 48 Lagos Kano 48 Lower Magdalena 48 Benin Togo 48 Semliki 47 Congo Equatorial Guinea 47 Mauritania Senegal 47 Benin Cameroon 47 Ilaje 47 Marmaton 47 Mauritania Mali 47 Guinea Guinea Bissau 47 drainages 46 gully erosion 46 creeks 46 Albert Rift 46 Wattenberg Field 46 Sahelian 46 Dahomey 46 Glauconite 45 Exploration Permits 45 Katsina Ala 45 Georgina Basin 45 Haynesville Bossier 45 Mesaverde 45 Senegal Sierra Leone 45 Piceance 45 river drainages 45 Swaziland Tanzania 45 Ekeremor 45 Rivers 44 Ogallala aquifer 44 hydro electric dams 44 Basin 44 Mauritania Mali Niger 44 sedimentary basin 44 Albany Shale 44 Aquifers 44 Nguru 44 Trans Amadi 44 Paradox Basin 44 senatorial districts 44 Malawi Mozambique 44 Polymetallic 44 kimberlite dykes 44 Permian basin 44 alluvial deposits 44 Ethiopian highlands 43 Omo River 43 Putumayo Basin 43 Ahoada 43 Lagos Port Harcourt 43 Ogoja 43 Ndokwa 43 Hausas 43 Benue 43 Kaiama 43 Ondo 43 Zambia Mozambique 43 Opobo 43 Carbonate 43 palaeochannel 43 East Kalimantan Indonesia 43 River Basins 43 Taparko 43 placer deposits 43 sedimentary basins 43 Quartzite 43 subsea wells 43 Quake Shakes 43 By Tony Edike 42 LGAs 42 groundwater aquifer 42 Diobu 42 tributary rivers 42 Basin WCSB 42 Isua 42 Burkina Faso Cameroon 42 basins 42 coastal lowlands 42 Temblor 42 Bomadi 42 Cuu Long 42 Ibos 42 Mopti 42 Ukwa 42 sandstone reservoirs 42 greenstone belts 42 Algeria Angola 42 Gokana 42 Buguma 42 Plateau