Philippines-Taiwan-China-Malaysia-Vietnam: Philippines claims sovereignty over Scarborough Reef (also claimed by China together with Taiwan) and over certain of the Spratly Islands, known locally as the Kalayaan (Freedom) Islands, also claimed by China, Malaysia, Taiwan, and Vietnam; 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; 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

Philippines-Malaysia: Philippines retains a dormant claim to Malaysia's Sabah State in northern Borneo based on the Sultanate of Sulu's granting the Philippines Government power of attorney to pursue a sovereignty claim on his behalf; the disagreement resurfaced in September 2020 , when Malaysia’s submission to the UN about extending its continental shelf was sharply countered by the Philippines because it included the disputed territory

Philippines-Palau: maritime delimitation negotiations continue with Palau, as of March 2022

Sudan-Central African Republic: periodic violent skirmishes persist among related pastoral populations along the border with the Central African Republic over water and grazing rights; Sudan closed its border with the Central African Republic in January 2022 due to security concerns

Sudan-Chad: Chad wants to be a helpful mediator in resolving the Darfur conflict, and in 2010 established a joint border monitoring force with Sudan, which has helped to reduce cross-border banditry and violence; however, since the August 2020 Juba Peace Agreement between the Sudanese Government and the Sudanese Revolutionary Front and the termination of the UN’s peacekeeping mission, UNAMID, at the end of 2020, violence continues to break out over land and water access

Sudan-Egypt: Sudan claims, but Egypt de facto administers, security and economic development of the Halaib region north of the 22nd parallel boundary

Sudan-Eritrea: none identified

Sudan-Ethiopia: civil unrest in eastern Sudan has hampered efforts to demarcate the porous boundary with Ethiopia; clashes continue between Sudan and Ethiopia over al-Fashaga, a fertile piece of land inhabited by Ethiopian farmers for years until the Sudanese army expelled them in December 2020, claiming the land belonged to Sudan based on colonial-era maps from over 100 years ago; in February, 2022, the two countries were discussing resuming talks over the border conflict; 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; Sudan is concerned the dam will reduce the flow of water into the country; Ethiopia completed filling the dam in 2023

Sudan-Libya: none identified

Sudan-South Sudan: the South Sudan-Sudan boundary represents 1 January 1956 alignment, final alignment pending negotiations and demarcation; final sovereignty status of Abyei area pending negotiations between South Sudan and Sudan; clashes continue in the oil-rich Abyei region; the United Nations Interim Security Force for Abyei (UNISFA) has been deployed since 2011, when South Sudan became independent; the United Nations Interim Security Force for Abyei (UNISFA) has condemned renewed clashes on 23 September 2022 between the Twik and Ngok Dinka communities taking place in Agok, 28 kilometres from Abyei town