Spain-Andorra: none identified

Spain-France: none identified

Spain-Gibraltar (UK): in 2002, Gibraltar residents voted overwhelmingly by referendum to reject any "shared sovereignty" arrangement; the Government of Gibraltar insists on equal participation in talks between the UK and Spain; Spain does not recognize British sovereignty beyond the original fortified perimeter of the city and disapproves of UK plans to grant Gibraltar greater autonomy; after voters in the UK chose to leave the EU in a June 2016 referendum, Spain again proposed shared sovereignty of Gibraltar; UK officials rejected Spain’s joint sovereignty proposal

Spain-Morocco: Morocco protests Spain's control over the coastal enclaves of Ceuta, Melilla, and the islands of Penon de Velez de la Gomera, Penon de Alhucemas, and Islas Chafarinas, and surrounding waters; both countries claim Isla Perejil (Leila Island), which remains unoccupied but was the site of a  military standoff in 2002; Morocco serves as the primary embarkation area for illegal migration into mainland Spain from North Africa

Spain-Portugal: Portugal does not recognize Spanish sovereignty over the territory of Olivenza based on a difference of interpretation of the 1815 Congress of Vienna and the 1801 Treaty of Badajoz

Nicaragua-El Salvador-Honduras: the 1992 ICJ ruling for El Salvador and Honduras advised a tripartite resolution to establish a maritime boundary in the Gulf of Fonseca, which considers Honduran access to the Pacific; the court ruled, rather, that the Gulf of Fonseca represents a condominium, with control being shared by El Salvador, Honduras, and Nicaragua; the decision allowed for the possibility that the three nations could divide the waters at a later date if they wished to do so

Nicaragua-Costa Rica: Nicaragua and Costa Rica regularly file border dispute cases with the ICJ over the delimitations of the San Juan River and the northern tip of Calero Island, virtually uninhabited areas claimed by both countries; there is an ongoing case in the ICJ to determine Pacific and Atlantic ocean maritime borders as well as land borders; in 2009, the ICJ ruled that Costa Rican vessels carrying out police activities could not use the river, but official Costa Rican vessels providing essential services to riverside inhabitants and Costa Rican tourists could travel freely on the river; in 2011, the ICJ provisionally ruled that both countries must remove personnel from the disputed area; in 2013, the ICJ rejected Nicaragua's 2012 suit to halt Costa Rica's construction of a highway paralleling the river on the grounds of irreparable environmental damage; in 2013, the ICJ, regarding the disputed territory, ordered that Nicaragua should refrain from dredging or canal construction and refill and repair damage caused by trenches connecting the river to the Caribbean and upheld its 2010 ruling that Nicaragua must remove all personnel; in early 2014, Costa Rica brought Nicaragua to the ICJ over offshore oil concessions in the disputed region; in 2018, the ICJ ruled that Nicaragua must remove a military base from a contested coastal area near the San Juan River, and that Costa Rica had sovereignty over the northern part of Isla Portillos, including the coast, but excluding Harbour Head Lagoon; additionally, Honduras was required to pay reparations for environmental damage to part of the wetlands at the mouth of the San Juan River

Nicaragua-Colombia: Nicaragua filed a case with the International Court of Justice (ICJ) against Colombia in 2013 over the delimitation of the Continental shelf beyond the 200 nautical miles from the Nicaraguan coast, as well as over the alleged violation by Colombia of Nicaraguan maritime space in the Caribbean Sea, which contains rich oil and fish resources; as of September 2021, Colombia refuses to abide by the ICJ ruling

Nicaragua-Honduras: none identified

Latvia-Belarus: Belarus and Latvia signed joint demarcation map in September 2008

Latvia-Estonia: demarcation reportedly completed in 1998

Latvia-Lithuania: boundary demarcation was completed by the end of 1998; the Latvian parliament has not ratified its 1998 maritime boundary treaty with Lithuania, primarily due to concerns over oil exploration rights

Latvia-Russia: Russia demands better Latvian treatment of ethnic Russians in Latvia; in March 2007, Latvia and Russia signed a border treaty, which includes Latvia withdrawing claims to a district now in Russia that was part of Latvia before WWII; the permanent demarcation of the boundary between Latvia and Russia was completed and came into force in April 2018; as a member state that forms part of the EU's external border, Latvia has implemented the strict Schengen border rules with Russia