| Country | Disputes - international |
| Saint Lucia | joins other Caribbean states to counter Venezuela's claim that Aves Island sustains human habitation, a criterion under UNCLOS, which permits Venezuela to extend its EEZ/continental shelf over a large portion of the eastern Caribbean Sea |
| Saint Martin | void |
| Saint Pierre and Miquelon | none |
| Saint Vincent and the Grenadines | joins other Caribbean states to counter Venezuela's claim that Aves Island sustains human habitation, a criterion under UNCLOS, which permits Venezuela to extend its EEZ/continental shelf over a large portion of the eastern Caribbean Sea |
| Samoa | none |
| San Marino | none |
| Sao Tome and Principe | none |
| Saudi Arabia | Saudi Arabia has reinforced its concrete-filled security barrier along sections of the now fully demarcated border with Yemen to stem illegal cross-border activities; Kuwait and Saudi Arabia continue discussions on a maritime boundary with Iran |
| Senegal | The Gambia and Guinea-Bissau attempt to stem separatist violence, cross border raids, and arms smuggling into their countries from Senegal's Casamance region, and in 2006, respectively accepted 6,000 and 10,000 Casamance residents fleeing the conflict; 2,500 Guinea-Bissau residents fled into Senegal in 2006 to escape armed confrontations along the border |
| Serbia | Serbia with several other states protest the U.S. and other states' recognition of Kosovo's declaring itself as a sovereign and independent state in February 2008; ethnic Serbian municipalities along Kosovo's northern border challenge final status of Kosovo-Serbia boundary; several thousand NATO-led KFOR peacekeepers under UNMIK authority continue to keep the peace within Kosovo between the ethnic Albanian majority and the Serb minority in Kosovo; Serbia delimited about half of the boundary with Bosnia and Herzegovina, but sections along the Drina River remain in dispute |
| Seychelles | together with Mauritius, Seychelles claims the Chagos Archipelago (UK-administered British Indian Ocean Territory) |
| Sierra Leone | as domestic fighting among disparate ethnic groups, rebel groups, warlords, and youth gangs in Cote d'Ivoire, Guinea, Liberia, and Sierra Leone gradually abate, the number of refugees in border areas has begun to slowly dwindle; UN Mission in Sierra Leone (UNAMSIL) has maintained over 4,000 peacekeepers in Sierra Leone since 1999; Sierra Leone considers excessive Guinea's definition of the flood plain limits to define the left bank boundary of the Makona and Moa rivers and protests Guinea's continued occupation of these lands including the hamlet of Yenga occupied since 1998 |
| Singapore | disputes persist with Malaysia over deliveries of fresh water to Singapore, Singapore's extensive land reclamation works, bridge construction, and maritime boundaries in the Johor and Singapore Straits; in November 2007, the ICJ will hold public hearings as a consequence of the Memorials and Countermemorials filed by the parties in 2003 and 2005 over sovereignty of Pedra Branca Island/Pulau Batu Puteh, Middle Rocks and South Ledge; Indonesia and Singapore continue to work on finalization of their 1973 maritime boundary agreement by defining unresolved areas north of Indonesia's Batam Island; piracy remains a problem in the Malacca Strait |
| Slovakia | bilateral government, legal, technical and economic working group negotiations continued in 2006 between Slovakia and Hungary over Hungary's completion of its portion of the Gabcikovo-Nagymaros hydroelectric dam project along the Danube; as a member state that forms part of the EU's external border, Slovakia has implemented the strict Schengen border rules |
| Slovenia | the Croatia-Slovenia land and maritime boundary agreement, which would have ceded most of Piran Bay and maritime access to Slovenia and several villages to Croatia, remains unratified and in dispute; Slovenia also protests Croatia's 2003 claim to an exclusive economic zone in the Adriatic; as a member state that forms part of the EU's external border, Slovenia has implemented the strict Schengen border rules to curb illegal migration and commerce through southeastern Europe while encouraging close cross-border ties with Croatia |
| Solomon Islands | since 2003, the Regional Assistance Mission to the Solomon Islands (RAMSI), consisting of police, military, and civilian advisors drawn from 15 countries, has assisted in reestablishing and maintaining civil and political order while reinforcing regional stability and security |
| Somalia | Ethiopian forces invaded southern Somalia and routed Islamist Courts from Mogadishu in January 2007; "Somaliland" secessionists provide port facilities in Berbera to landlocked Ethiopia and have established commercial ties with other regional states; "Puntland" and "Somaliland" "governments" seek international support in their secessionist aspirations and overlapping border claims; the undemarcated former British administrative line has little meaning as a political separation to rival clans within Ethiopia's Ogaden and southern Somalia's Oromo region; Kenya works hard to prevent the clan and militia fighting in Somalia from spreading south across the border, which has long been open to nomadic pastoralists |
| South Africa | South Africa has placed military along the border to apprehend the thousands of Zimbabweans fleeing economic dysfunction and political persecution; as of January 2007, South Africa also supports large numbers of refugees and asylum seekers from the Democratic Republic of the Congo (33,000), Somalia (20,000), Burundi (6,500), and other states in Africa (26,000); managed dispute with Namibia over the location of the boundary in the Orange River; in 2006, Swazi king advocates resort to ICJ to claim parts of Mpumalanga and KwaZulu-Natal from South Africa |
| South Georgia and the South Sandwich Islands | Argentina, which claims the islands in its constitution and briefly occupied them by force in 1982, agreed in 1995 to no longer seek settlement by force |
| Southern Ocean | Antarctic Treaty defers claims (see Antarctica entry), but Argentina, Australia, Chile, France, NZ, Norway, and UK assert claims (some overlapping), including the continental shelf in the Southern Ocean; several states have expressed an interest in extending those continental shelf claims under the United Nations Convention on the Law of the Sea (UNCLOS) to include undersea ridges; the US and most other states do not recognize the land or maritime claims of other states and have made no claims themselves (the US and Russia have reserved the right to do so); no formal claims exist in the waters in the sector between 90 degrees west and 150 degrees west |
| Spain | in 2002, Gibraltar residents voted overwhelmingly by referendum to remain a British colony and against a "total shared sovereignty" arrangement while demanding participation in talks between the UK and Spain; Spain disapproves of UK plans to grant Gibraltar greater autonomy; 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; Morocco serves as the primary launching site of illegal migration into Spain from North Africa; 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 |
| Spratly Islands | all of the Spratly Islands are claimed by China, Taiwan, and Vietnam; parts of them are claimed by Malaysia and the Philippines; in 1984, Brunei established an exclusive fishing zone that encompasses Louisa Reef in the southern Spratly Islands but has not publicly claimed the reef; claimants in November 2002 signed the "Declaration on the Conduct of Parties in the South China Sea," which has eased tensions but falls short of a legally binding "code of conduct"; in March 2005, the national oil companies of China, the Philippines, and Vietnam signed a joint accord to conduct marine seismic activities in the Spratly Islands |
| Sri Lanka | none |
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