Western Sahara covers an area of approximately 266,000 sq km. Its terrain consists of mostly low, flat desert with large areas of rocky or sandy surfaces rising to small mountains in the south and northeast. Western Sahara borders Algeria, Mauritania and Morocco, and has 1,110 km of coastline. The country has no official capital, and its time zone corresponds to that of GMT. Economic activity is based around pastoral nomadism, fishing and phosphate mining. The population of approximately 405,000 people has an ethnic mix including Arabs and Berbers. Primary languages are Hassaniya Arabic and Moroccan Arabic, and the predominant religion is Islam.