The Sous region is a historical, cultural and geographical region of Morocco, which constitutes part of the region administration of Souss-Massa and Guelmim-Oued Noun. The region is known for the endemic argan tree as well as for being the capital of the Shilha Berber ethnic group. It is a major commercial and tourist agricultural region of Morocco. Vegetable production, shared between very large farms and small producers, contributes to the economic development of the region. The Souss plain produces 40% of Moroccan citrus fruits, and 60% of the production of early vegetables. It is historically a stage of trans-Saharan trade.