evidence: Saudi Arabia, arid, sparsely populated kingdom of the Middle East that in the 20th century became one of the world’s largest oil-producing countries in terms of output. It is ruled by the Saud family, which in the 18th century entered an alliance with the austere and conservative Wahhābī Islamic movement. Mohammed bin Salman, the forceful crown prince, is the de facto ruler, acting on behalf of his elderly father King Salman. [...] The country occupies about four-fifths of the Arabian Peninsula. It is bordered by Jordan, Iraq, and Kuwait to the north; by the Persian Gulf, Qatar, the United Arab Emirates, and Oman to the east; by a portion of Oman to the southeast; by Yemen to the south and southwest; and by the Red Sea and the Gulf of Aqaba to the west. Long-running border disputes were nearly resolved with Yemen (2000) and Qatar (2001); the border with the United Arab Emirates remains undefined. A territory of 2,200 square miles (5,700 square km) along the gulf coast was shared by Kuwait and Saudi Arabia as a neutral zone until 1969, when a political boundary was agreed upon. Each of the two countries administers one-half of the territory, but they equally share oil production in the entire area. The controversy over the Saudi-Iraqi Neutral Zone was legally settled in 1981 by partition, yet conflict between the two countries persisted and prevented final demarcation on the ground.