Egypt — nile borders (1): SudanEgyptSudan — nile borders (6): Central African Republic, Chad, Egypt, Eritrea, Ethiopia, South SudanSudanSouth Sudan — nile borders (6): Central African Republic, DR Congo, Ethiopia, Kenya, Sudan, UgandaSouth SudanEthiopia — nile borders (6): Djibouti, Eritrea, Kenya, Somalia, South Sudan, SudanEthiopiaEritrea — nile borders (3): Djibouti, Ethiopia, SudanEritreaMauritania — sahel borders (1): MaliMauritaniaMali — sahel borders (3): Burkina Faso, Mauritania, NigerMaliNiger — sahel borders (5): Benin, Burkina Faso, Chad, Mali, NigeriaNigerChad — sahel borders (5): Cameroon, Central African Republic, Niger, Nigeria, SudanChadBurkina Faso — sahel borders (4): Benin, Mali, Niger, TogoBurkina FasoTogo — niger_delta borders (2): Benin, Burkina FasoTogoBenin — niger_delta borders (4): Burkina Faso, Niger, Nigeria, TogoBeninNigeria — niger_delta borders (4): Benin, Cameroon, Chad, NigerNigeriaCameroon — niger_delta borders (6): Central African Republic, Chad, Congo, Equatorial Guinea, Gabon, NigeriaCameroonDjibouti — horn borders (3): Eritrea, Ethiopia, SomaliaDjiboutiSomalia — horn borders (3): Djibouti, Ethiopia, KenyaSomaliaKenya — horn borders (5): Ethiopia, Somalia, South Sudan, Tanzania, UgandaKenyaUganda — horn borders (5): DR Congo, Kenya, Rwanda, South Sudan, TanzaniaUgandaCentral African Republic — congo_basin borders (6): Cameroon, Chad, Congo, DR Congo, South Sudan, SudanCentral African RepublicDR Congo — congo_basin borders (9): Angola, Burundi, Central African Republic, Congo, Rwanda, South Sudan, Tanzania, Uganda, ZambiaDR CongoCongo — congo_basin borders (5): Angola, Cameroon, Central African Republic, DR Congo, GabonCongoGabon — congo_basin borders (3): Cameroon, Congo, Equatorial GuineaGabonEquatorial Guinea — congo_basin borders (2): Cameroon, GabonEquatorial GuineaAngola — congo_basin borders (3): Congo, DR Congo, ZambiaAngolaRwanda — great_lakes borders (4): Burundi, DR Congo, Tanzania, UgandaRwandaBurundi — great_lakes borders (3): DR Congo, Rwanda, TanzaniaBurundiTanzania — great_lakes borders (7): Burundi, DR Congo, Kenya, Malawi, Rwanda, Uganda, ZambiaTanzaniaZambia — great_lakes borders (4): Angola, DR Congo, Malawi, TanzaniaZambiaMalawi — great_lakes borders (2): Tanzania, ZambiaMalawi