The Marehan (Mareexaan, مريحان) is a Somali clan, which is part of one of the largest Somali clans families, the Darod. The clan is one of the largest constituent sub-clans of the Darod. The majority of the Marehan live in the Jubaland in southern Somalia, as well as the Galguduud and Mudug regions in central Somalia, the Somali region of Ethiopia and the North Eastern Province of Kenya.
The Marehan of Darood Jabarti are a noble Clan that has a history of rulership starting from before the Times of Adal, to the Imamate of Aussa and Emirate or harar, up until the modern Somali State. The Marehan were based in northern and central somali lands until a portion of the clan ventured down south, and even reached into the interior of Kenya before being repelled by the British. The Marehan have maintained a population in the south of Somalia, specially Jubaland region since the 1820s.
Between the 17th and 18th centuries, the Marehan were reported to have lived in an area that extended from the Bandar Siyada on the Gulf of Aden to beyond Ras el-Khail on the Indian Ocean, or much of northern Somalia.
The clan are recorded as having played a significant role in Imam Ahmad ibn Ibrihim al-Ghazi's campaigns against Ethiopia during the 16th century. Imam Ahmad alongside his successor Emir Nur ibn Al-Mujahid and The commander of the Somali forces and the closest deputy of the Imam, commander, Garad Ahmed bin Hirabu all hailed from the Marehan clan. The Marehan along with the Habar Maqdi of the Jidwaaq;helped push westward the enemies into the plains of Harar and farther, helping destabilize the highland Christian empire. Evident in these battles were the Somali archers, namely the Marehan and the Gerri horsemen, through whom al-Ghazi was able to defeat the numerically superior Ethiopian Army that consisted of 16,000 cavalry and more than 200,000 infantry. As early as 1820s, the Marehan were reported to have lived in Jubaland.
The Juba Valley Alliance is a political faction of the Somali Civil War.