Sanag is an administrative region (gobol) in north eastern Somaliland. Sanaag has a long coastline facing the Gulf of Aden to the north, and is bordered by the region of Sahil to the west, Sool to the south and Somalia to the east. The region is disputed by the self-declared Republic of Somaliland and Puntland, a Federal Member State of Somalia. Its capital city is Erigavo. Sanaag is the largest region of Somaliland, accounting for 35% of Somaliland's total land area.

Somaliland, officially the Republic of Somaliland, is an unrecognised country in the Horn of Africa, recognised internationally as de jure part of Somalia. It is located in the southern coast of the Gulf of Aden and bordered by Djibouti to the northwest, Ethiopia to the south and west, and Somalia to the east. Its claimed territory has an area of 176,120 square kilometres (68,000 sq mi), with approximately 6.2 million residents as of 2024. The capital and largest city is Hargeisa. The Government of Somaliland regards itself as the successor state to British Somaliland, which, as the briefly independent State of Somaliland, united from 1960 to 1991 with the Trust Territory of Somaliland to form the Somali Republic.