| Country | Disputes - international |
| Barbados | in April 2006, the Permanent Court of Arbitration issued a decision that delimited a maritime boundary with Trinidad and Tobago and compelled Barbados to enter a fishing agreement limiting Barbadian fishermen's catches of flying fish in Trinidad and Tobago's exclusive economic zone; in 2005, Barbados and Trinidad and Tobago agreed to compulsory international arbitration under UNCLOS challenging whether the northern limit of Trinidad and Tobago's and Venezuela's maritime boundary extends into Barbadian waters; joins other Caribbean states to counter Venezuela's claim that Aves Island sustains human habitation, a criterion under the UN Convention on the Law of the Sea (UNCLOS), which permits Venezuela to extend its EEZ/continental shelf over a large portion of the eastern Caribbean Sea |
| Belarus | as of January 2007, ground demarcations of the boundaries with Latvia and Lithuania were complete and mapped with final ratification documentation in preparation; 1997 boundary delimitation treaty with Ukraine remains unratified over unresolved financial claims, preventing demarcation and diminishing border security |
| Belgium | none |
| Belize | annual ministerial meetings under the OAS-initiated Agreement on the Framework for Negotiations and Confidence Building Measures continue to address Guatemalan land and maritime claims in Belize and Caribbean Sea; the Line of Adjacency created under the 2002 Differendum serves in lieu of the contiguous international boundary to control squatting in the sparsely inhabited rain forests of Belize's border region; Honduras claims Belizean-administered Sapodilla Cays in its constitution but agreed to a joint ecological park under the Differendum |
| Benin | two villages remain in dispute along the border with Burkina Faso; Benin accused Burkina Faso of moving boundary pillars; much of Benin-Niger boundary, including tripoint with Nigeria, remains undemarcated; in 2005, Nigeria ceded thirteen villages to Benin, but border relations remain strained by rival gang clashes; Benin and Togo announced plans in 2006 to construct a joint hydroelectric dam on the Mona River at the southern end of the border |
| Bermuda | none |
| Bhutan | over 100,000 Bhutanese Lhotshampas (Hindus) have been confined in seven UN Office of the High Commissioner for Refugees camps since 1990; Bhutan cooperates with India to expel Indian Nagaland separatists; lacking any treaty describing the boundary, Bhutan and China continue negotiations to establish a boundary alignment to resolve substantial cartographic discrepancies, the largest of which lies in Bhutan's northwest |
| Bolivia | Chile rebuffs Bolivia's reactivated claim to restore the Atacama corridor, ceded to Chile in 1884, offering instead unrestricted but not sovereign maritime access through Chile for Bolivian natural gas and other commodities |
| Bosnia and Herzegovina | Bosnia and Herzegovina and Serbia have delimited most of their boundary, but sections along the Drina River remain in dispute; discussions continue with Croatia on several small disputed sections of the boundary related to maritime access that hinder final ratification of the 1999 border agreement |
| Botswana | the alignment of the boundary with Namibia in the Kwando/Linyanti/Chobe River, including the Situngu marshlands, was resolved amicably in 2003; concerns from international experts and local populations over the ecology of the Okavango Delta in Botswana and human displacement scuttled Namibian plans to construct a hydroelectric dam at Popavalle (Popa Falls) along the Angola-Namibia border; Botswana has built electric fences to stem the thousands of Zimbabweans who flee to find work and escape political persecution; Namibia has long supported, and in 2004 Zimbabwe dropped objections to, plans between Botswana and Zambia to build a bridge over the Zambezi River, thereby de facto recognizing the short, but not clearly delimited, Botswana-Zambia boundary |
| Bouvet Island | none |
| Brazil | unruly region at convergence of Argentina-Brazil-Paraguay borders is locus of money laundering, smuggling, arms and illegal narcotics trafficking, and fundraising for extremist organizations; uncontested dispute with Uruguay over certain islands in the Quarai/Cuareim and Invernada boundary streams and the resulting tripoint with Argentina |
| British Indian Ocean Territory | Mauritius and Seychelles claim the Chagos Archipelago including Diego Garcia; in 2001, the former inhabitants of the Chagos Archipelago, evicted in 1967 and 1973 and now residing chiefly in Mauritius, were granted UK citizenship and the right to repatriation; in May 2006, the High Court of London reversed U.K. Government's 2004 orders of council that banned habitation on the islands; a small group of Chagossians visited Diego Garcia in April 2006; repatriation is complicated by the exclusive US military lease of Diego Garcia that restricts access to the largest viable island in the chain |
| British Virgin Islands | none |
| Brunei | Brunei and Malaysia are still considering international adjudication over their disputed offshore and deepwater seabeds, where hydrocarbon exploration was terminated in 2003 international legal adjudication; Malaysia's land boundary with Brunei around Limbang is in dispute; Brunei established an exclusive economic fishing zone encompassing Louisa Reef in the southern Spratly Islands in 1984, but makes no public territorial claim to the offshore reefs; the 2002 "Declaration on the Conduct of Parties in the South China Sea" has eased tensions in the Spratly Islands but falls short of a legally binding "code of conduct" desired by several of the disputants |
| Bulgaria | none |
| Burkina Faso | two villages remain in dispute along the border with Benin; Benin accuses Burkina Faso of moving boundary pillars; in recent years citizens and rogue security forces rob and harass local populations on both sides of the poorly-defined Burkina Faso-Niger border; despite the presence of over 9,000 UN forces (UNOCI) in Cote d'Ivoire since 2004, ethnic conflict continues to spread into neighboring states who can no longer send their migrant workers to work in Ivorian cocoa plantations |
| Burma | over half of Burma's population consists of diverse ethnic groups who have substantial numbers of kin in neighboring countries; Thailand must deal with Karen and other ethnic rebels, illegal cross-border activities, Karen and other refugees, and asylum seekers from Burma; Thailand is studying the feasibility of jointly constructing the Hatgyi Dam on the Salween River near the border with Burma; in 2004, international environmentalist pressure prompted China to halt construction of 13 dams on the Salween River which flows through China, Burma, and Thailand; India seeks cooperation from Burma to keep Indian Nagaland separatists, such as the United Liberation Front of Assam, from hiding in remote Burmese Uplands; Burmese Rohingya Muslim refugees reside in two camps in Bangladesh |
| Burundi | conflicts among Tutsi, Hutu, other ethnic groups, associated political rebels, armed gangs, and various government forces have abated somewhat in the Great Lakes region; UN Operation in Burundi (ONUB) completed its mandate in December 2006 after a three-year peace-keeping mission |
| Cambodia | Southeast Asian states must maintain border surveillance to check the spread of avian flu; Cambodia and Thailand dispute sections of boundary with missing boundary markers and claims of Thai encroachments into Cambodian territory; maritime boundary with Vietnam is hampered by unresolved dispute over sovereignty of offshore islands; Cambodia accuses Thailand of obstructing access to Preah Vihear temple ruins awarded to Cambodia by ICJ decision in 1962 |
| Cameroon | Joint Border Commission with Nigeria reviewed 2002 ICJ ruling on the entire boundary and bilaterally resolved differences, including June 2006 Greentree Agreement that immediately cedes sovereignty of the Bakassi Peninsula to Cameroon with a phase-out of Nigerian control within two years while resolving patriation issues; implementation of the ICJ ruling on the Cameroon-Equatorial Guinea-Nigeria maritime boundary in the Gulf of Guinea is pending due to imprecisely defined coordinates and a sovereignty dispute between Equatorial Guinea and Cameroon over an island at the mouth of the Ntem River; only Nigeria and Cameroon have heeded the Lake Chad Commission's admonition to ratify the delimitation treaty, which also includes the Chad-Niger and Niger-Nigeria boundaries |
| Canada | managed maritime boundary disputes with the US at Dixon Entrance, Beaufort Sea, Strait of Juan de Fuca, and around the disputed Machias Seal Island and North Rock; US works closely with Canada to intensify security measures to monitor and control legal and illegal personnel, transport, and commodities across the international border; sovereignty dispute with Denmark over Hans Island in the Kennedy Channel between Ellesmere Island and Greenland |
| Cape Verde | none |
| Cayman Islands | none |
| Central African Republic | periodic skirmishes over water and grazing rights among related pastoral populations along the border with southern Sudan persist |
| Chad | since 2003, Janjawid armed militia and the Sudanese military have driven hundreds of thousands of Darfur residents into Chad; Chad remains an important mediator in the Sudanese civil conflict, reducing tensions with Sudan arising from cross-border banditry; Chadian Aozou rebels reside in southern Libya; only Nigeria and Cameroon have heeded the Lake Chad Commission's admonition to ratify the delimitation treaty, which also includes the Chad-Niger and Niger-Nigeria boundaries |
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