Ethiopia-Eritrea: Eritrea and Ethiopia agreed to abide by the 2002 Eritrea-Ethiopia Boundary Commission's (EEBC) delimitation decision, but neither party responded to the revised line detailed in the November 2006 EEBC Demarcation Statement

Ethiopia-Somalia: the undemarcated former British administrative line has little meaning as a political separation to rival clans within Ethiopia's Ogaden (populated largely by ethnic Somalis) and southern Somalia's Oromo region; the Somalia-based terrorist group al-Shabaab has conducted cross-border assaults into Ethiopia as recently as 2022

Ethiopia-South Sudan: while border clashes continue in the al-Fashqa (Fashaga) area, the US views the 1902 boundary treaty between Ethiopia and Sudan as being in force

Ethiopia-Sudan: Ethiopia's construction of a large dam (the Grand Ethiopian Renaissance Dam) on the Blue Nile in northern Ethiopia since 2011 has become a focal point of relations with Egypt and Sudan; Egypt has described the giant hydroelectric project as an existential threat because of its potential to control the flow of the river that is a key source of water for the country; Ethiopia completed filling the dam in 2023

Saudi Arabia-Bahrain: none identified

Saudi Arabia-Iraq:  Saudi Arabia has been building a fence along its border with Iraq to keep out militants and smugglers

Saudi Arabia-Jordan: Jordan and Saudi Arabia signed an agreement to demarcate their maritime borders in 2007

Saudi Arabia-Kuwait: Kuwait and Saudi Arabia continue discussions on a maritime boundary with Iran; in December 2019, Saudi Arabia and Kuwait signed an agreement to demarcate land in a neutral zone and to restart oil production in shared fields, which had been suspended since 2014 because of disagreements

Saudi Arabia-Oman: none identified

Saudi Arabia-Qatar: none identified

Saudi Arabia-UAE: Saudi Arabia and UAE have disputed the Shaybah oilfield, which Saudi Arabia controls

Saudi Arabia-Yemen: the two countries signed the Treaty of Jeddah in 2000, which specified the coordinates of their land and maritime border and made provisions for grazing, the placement of armed forces, and future resource exploitation; in 2010, Saudi Arabia reinforced its concrete-filled security barrier along sections of the now fully demarcated border with Yemen to stem illegal crossborder activities

Morocco-Algeria: Algeria's border with Morocco remains an irritant to bilateral relations, each nation accusing the other of harboring militants and arms smuggling

Morocco-Mauritania: tensions arose in 2016 when Mauritanian soldiers were deployed to Lagouira, a city in the southernmost part of Morocco, and raised their flag

Morocco-Spain: Morocco protests Spain's control over the coastal enclaves of Ceuta, Melilla, and Penon de Velez de la Gomera, the islands of Penon de Alhucemas and Islas Chafarinas, and surrounding waters; both countries claim Isla Perejil (Leila Island); discussions have not progressed on a comprehensive maritime delimitation, setting limits on resource exploration and refugee interdiction, since Morocco's 2002 rejection of Spain's unilateral designation of a median line from the Canary Islands; Morocco serves as one of the primary launching areas of illegal migration into Spain from North Africa