It covers an area of 178.5 square kilometres (68.9 sq mi)[1] and recorded a population of 209,897 in the 2014 Moroccan census.

Jebel Musa, located in the northern part of the prefecture, is its highest point at 851 metres.

[3] The coastline at the base of Jebel Musa is a Ramsar site, and this area and portions of the mountainous interior are part of the Intercontinental Biosphere Reserve of the Mediterranean.

[3] M'diq-Fnideq was created in 2004 from the municipalities of M'diq and Fnideq and the rural commune of Allyene, all formerly part of Tétouan Province.

It has a capacity of 40.7 million cubic metres and supplies potable and industrial water to the prefecture.