The country has an area of 48,489 square miles and a population of 5.5 million. Although reliable statistics are not available, it is estimated that 50 percent of the population is Sunni Muslim, 30 percent is Orthodox Christian, and 13 percent is Roman Catholic. Groups that constitute less than 5 percent of the population include Protestants, Seventh-day Adventists, Jehovah's Witnesses, Buddhists, Hindus, and Baha'is. Approximately 2 percent of the population practices indigenous religious beliefs. The population is predominantly Muslim in the eastern and western lowlands and predominantly Christian in the highlands. Religious participation is high among all ethnic groups.