Shia Islam in Yemen is practiced by a substantial minority of the population, with the vast majority of Shia Muslims in Yemen being Zaydi, while a minority are Isma'ili. Sunni Muslims make up 65% percent of Yemen, while 35% of the country are Shia Muslims. These Shia Muslims are predominantly concentrated in the northwestern regions of the country, including the capital and major cities that are some of the most densely populated areas of Yemen.