Tashelhiyt or Tachelhit (/ˈtæʃəlhɪt/ TASH-əl-hit; from the endonym Taclḥiyt, IPA: [tæʃlħijt]), or also known as Shilha (/ˈʃɪlhə/ SHIL-hə; from its name in Moroccan Arabic, Šəlḥa) is a Berber language spoken in southwestern Morocco. When referring to the language, anthropologists and historians prefer the name Shilha, which is in the Oxford English Dictionary (OED). Linguists writing in English prefer Tashelhit (or a variant spelling). In French sources the language is called tachelhit, chelha or chleuh.
Shilha is spoken in an area covering around 100,000 square kilometres. The area comprises the western part of the High Atlas mountains and the regions to the south up to the Draa River, including the Anti-Atlas and the alluvial basin of the Sous River. The largest urban centres in the area are the coastal city of Agadir (population over 400,000) and the towns of Guelmim, Taroudant, Oulad Teima, Tiznit and Ouarzazate.