Which UN mission operates in the disputed Abyei region, straddling the border between Sudan and South Sudan?

💡 Explanation:

The United Nations Interim Security Force for Abyei (UNISFA) was established by the UN Security Council in June 2011 to monitor the Abyei Area, which is contested by Sudan and South Sudan, and to protect civilians under imminent threat. UNAMID was the mission in Darfur, UNMISS is the mission in South Sudan, and MINUSCA is in the Central African Republic.