The following is a list of border conflicts between two or more countries. The list includes only those fought because of border disputes. See List of territorial disputes for those that do not involve fighting.
19th century[edit]
| Start | Finish | Conflict | Combatants | Disputed Territories | Fatalities |
|---|---|---|---|---|---|
| 1846 | 1848 | Mexican–American War |  United States v.  Mexico |
TexasSanta Fe de Nuevo México
Alta California |
~29,000 |
| 1859 | 1859 | Pig War (1859) | United States v.  United Kingdom (Colony of Vancouver Island) |
San Juan Islands | one pig |
| 1879 | 1883 | War of the Pacific |  Chile v.  Bolivia and  Peru |
Litoral Department | ~10,000 |
20th century before World War II[edit]
| Start | Finish | Conflict | Combatants | Disputed Territories | Fatalities |
|---|---|---|---|---|---|
| 1910 | 1918 | Border War |  United States v.  Mexico |
Mexico-United States border region | 100+ |
| 1932 | 1935 | Chaco War | Bolivia v.  Paraguay |
northern Gran Chaco | ~100,000 |
| 1938 | 1938 | Battle of Lake Khasan |  Soviet Union v.  Japan |
Manchukuo–Soviet Union border region | ~1,300 |
| 1939 | 1939 | Slovak–Hungarian War |  Slovakia v.  Hungary |
Eastern Slovakia | 69 |
| 1939 | 1939 | Battles of Khalkhin Gol | Soviet Union and  Mongolia v. Japan and  Manchukuo |
Manchukuo–Soviet Union border region | ~48,000 |
1945–2000[edit]
| Start | Finish | Conflict | Combatants | Disputed Territories | Fatalities |
|---|---|---|---|---|---|
| 1947 | 1948 | Indo-Pakistani War of 1947–1948 |  India v.  Pakistan |
Jammu and Kashmir | ~3,000 |
| 1954 | 1954 | Annexation of Dadra and Nagar Haveli | India v.  Portugal |
Dadra and Nagar Haveli | 46 |
| 1956 | 1956 | Suez Crisis |  Israel v.  Egypt |
Sinai PeninsulaSuez Canal Zone | 2,848-4,198 |
| 1957 | 1958 | Ifni War |  Morocco v.  France and  Spain |
Spanish Ifni | |
| 1962 | 1962 | Sino-Indian War |  China v. India |
Aksai Chin | ~4,000 |
| 1965 | 1965 | Indo-Pakistani War of 1965 | Pakistan v. India |
Kashmir | ~6,800 |
| 1969 | 1969 | Sino-Soviet border conflict |  Soviet Union v. China |
Zhenbao IslandUssuri River | |
| 1971 | 1971 | Indo-Pakistani War of 1971 | Pakistan v. India |
KashmirEast Pakistan | ~4,000+ |
| 1978 | 1979 | Uganda–Tanzania War |  Uganda v.  Tanzania |
Kagera Salient | ~4,500 |
| 1979 | 1979 | Sino-Vietnamese War | China v.  Vietnam |
Cao BằngLạng Sơn
Spratly Islands |
~56,000 |
| 1984 | Ongoing | Whisky War |  Denmark v.  Canada |
Hans Island | 0 |
| 1984 | 1987 | Siachen conflict | Pakistan v. India |
Siachen Glacier | ~2,400. |
| 1985 | 1985 | Agacher Strip War |  Burkina Faso v.  Mali |
Agacher Strip | |
| 1987 | 1987 | Sumdorong Chu standoff | India v. China |
Sumdorong Chu | Unknown |
| 1999 | 1999 | Kargil War | India v. Pakistan |
Kargil district | ~4,500 |
| 1998 | 2000 | Eritrean–Ethiopian War |  Eritrea v.  Ethiopia |
Badme | 100,000 |
21st century[edit]
| Start | Finish | Conflict | Combatants | Disputed Territory | Fatalities |
|---|---|---|---|---|---|
| 2000 | 2006 | 2000–2006 Shebaa Farms conflict | Israel v.  Lebanon |
Shebaa farms | 30 |
| 2001 | 2001 | 2001 Bangladesh–India border clashes |  Bangladesh v. India |
Bangladesh–India border region | 20 |
| 2001 | 2002 | 2001–2002 India–Pakistan standoff | India v. Pakistan |
Kashmir | 789–1,874 |
| 2002 | 2002 | Perejil Island crisis | Morocco v. Spain |
Perejil Island | 0 |
| 2003 | 2005 | Conflict in Tuzla Island |  Ukraine v.  Russia |
Tuzla Island | 0 |
| 2006 | 2006 | 2006 Lebanon War | Israel v. Lebanon |
Northern District, Southern Lebanon and Golan Heights | 1,619-2,254 |
| 2008 | 2008 | Djiboutian–Eritrean border conflict |  Djibouti v. Eritrea |
Ras Doumeira | 144 |
| 2008 | 2008 | Russo-Georgian War |  Georgia v. Russia |
South Ossetia and Abkhazia | 247 (only Georgian and Russian casualties) |
| 2008 | 2012 | Cambodian–Thai border dispute |  Cambodia v.  Thailand |
Preah Vihear Temple | 42 |
| 2008 | 2008 | 2008 Indo-Pakistani standoff | India v. Pakistan |
Indo-Pakistani border region | Unknown |
| 2008 | 2008 | 2008 Mardakert clashes |  Artsakh v.  Azerbaijan |
Nagorno-Karabakh (Martakert/Aghdara) | 4-20 |
| 2010 | 2010 | 2010 Nagorno-Karabakh clashes |  Armenia v. Azerbaijan |
GoranboyTartar
Agdam |
3-6 |
| 2010 | 2010 | 2010 Mardakert clashes | Armenia and Artsakh v. Azerbaijan |
Fuzuli DistrictÇaylı
Nagorno-Karabakh (Jraberd) |
8-62 |
| 2010 | 2010 | 2010 Eritrean–Ethiopian border skirmish | Eritrea v. Ethiopia |
Zalambessa | 10-35 |
| 2010 | 2010 | Costa Rica–Nicaragua San Juan River border dispute |  Costa Rica v.  Nicaragua |
San Juan River | 0 |
| 2011 | 2011 | Battle of Wazzin |  Libya v.  Tunisia |
Wazzin | 23 (only Libyan and Tunisian casualties) |
| 2011 | 2011 | 2011 India–Pakistan border skirmish | India v. Pakistan |
Kashmir (Kupwara District and Neelum Valley) | 8 |
| 2012 | 2012 | Heglig Crisis |  Sudan v.  South Sudan |
Unity StateSouth Kordofan | 262–322 |
| 2012 | 2014 | Syrian–Turkish border clashes during the Syrian civil war |  Syria v.  Turkey |
Akçakale | 17 |
| 2012 | Ongoing | Israeli–Syrian ceasefire line incidents during the Syrian civil war | Israel v. Syria |
Quneitra GovernorateGolan Heights | 44 (only Israeli and Syrian casualties) |
| 2012 | 2012 | 2012 Armenian–Azerbaijani border clashes | Armenia and Artsakh v. Azerbaijan |
TavushQazakh
Nagorno-Karabakh |
9 |
| 2013 | 2013 | 2013 India–Pakistan border skirmishes | India v. Pakistan |
Kashmir Line of Control | 28 |
| 2014 | Ongoing | Russo-Ukrainian War | Ukraine v. Russia |
CrimeaDonbass | 2,824-2,924+ (only Russian and Ukrainian casualties) |
| 2014 | 2014 | 2014 Armenian–Azerbaijani clashes | Armenia and Artsakh v. Azerbaijan |
Armenia–Azerbaijan border region (Tavush, Qazakh)Nagorno-Karabakh Line of Contact | 19 |
| 2014 | 2015 | 2014–2015 India–Pakistan border skirmishes | India v. Pakistan |
Kashmir Line of ControlIndo-Pakistani border region | 58-185 |
| 2016 | 2016 | 2016 Nagorno-Karabakh conflict | Armenia and Artsakh v. Azerbaijan |
Armenia–Azerbaijan border region (Tavush, Qazakh)Nagorno-Karabakh Line of Contact | 199-1,820 |
| 2016 | 2016 | Battle of Tsorona | Eritrea v. Ethiopia |
Tserona Subregion | 218 |
| 2016 | 2016 | 2016 Belize–Guatemala border standoff |  Belize v.  Guatemala |
Sarstoon River | 1 |
| 2016 | Ongoing | 2016–2018 India–Pakistan border skirmishes | India v. Pakistan |
Azad Kashmir | 165-232 (only Indian and Pakistani casualties) |
| 2017 | 2017 | 2017 Afghanistan–Pakistan border skirmish |  Afghanistan v. Pakistan |
Chaman | 8-68 |
| 2017 | 2017 | 2017 China–India border standoff | China v. India and  Bhutan |
Doklam | 0[1] |
| 2018 | 2018 | 2018 Armenian–Azerbaijani clashes | Armenia v. Azerbaijan |
Nakhchivan Autonomous Republic (Sharur District and Sadarak District) | 2–3[2][3][4] |
| 2019 | 2019 | 2019 India–Pakistan border skirmishes | India v. Pakistan |
Line of Control | 50-62 |
| 2020 | 2020 | July 2020 Armenian–Azerbaijani clashes | Armenia v. Azerbaijan |
Movses, Armenia and Ağdam, Azerbaijan | 17-141 |
| 2020 | Ongoing | 2020–2021 China–India skirmishes | China v. India |
Sikkim, Ladakh and Line of Actual Control | 50+ on both sides |
| 2020 | Ongoing | 2020–2021 Ethiopian–Sudanese clashes | Ethiopia v. Sudan |
Ethiopian–Sudanese border | 4 (only Sudanese casualties) |
| 2021 | 2021 | 2021 Kyrgyzstan–Tajikistan conflict |  Kyrgyzstan v.  Tajikistan |
Leilek District | 55 |