Highway 40 (Saudi Arabia)
Highway 40 is the most important highway of Saudi Arabia
Saudi Arabia
The Kingdom of Saudi Arabia , commonly known in British English as Saudi Arabia and in Arabic as as-Sa‘ūdiyyah , is the largest state in Western Asia by land area, constituting the bulk of the Arabian Peninsula, and the second-largest in the Arab World...

, linking the largest cities by crossing the entire country and Arabian desert. The 1,359 km highway connects Jeddah
Jeddah, Jiddah, Jidda, or Jedda is a city located on the coast of the Red Sea and is the major urban center of western Saudi Arabia. It is the largest city in Makkah Province, the largest sea port on the Red Sea, and the second largest city in Saudi Arabia after the capital city, Riyadh. The...

 and Mecca
Mecca is a city in the Hijaz and the capital of Makkah province in Saudi Arabia. The city is located inland from Jeddah in a narrow valley at a height of above sea level...

 on the west coast to Dammam
Dammam is the capital of the Eastern Province of Saudi Arabia, the most oil-rich region in the world. The judicial and administrative bodies of the province and several government departments are located in the city. Dammam is the largest city in the Eastern Province and third largest in Saudi...

 on the east coast, passing through the capital of Riyadh
Riyadh is the capital and largest city of Saudi Arabia. It is also the capital of Riyadh Province, and belongs to the historical regions of Najd and Al-Yamama. It is situated in the center of the Arabian Peninsula on a large plateau, and is home to 5,254,560 people, and the urban center of a...

 on the way where it intersects with Highway 65
Highway 65 (Saudi Arabia)
Highway 65 or Route 65, popularly known as the Qassim Highway is a major highway of central Saudi Arabia. It connects the capital of Riyadh to Buraidah,Ha'il and finally Al Jawf in the northwest, and Al-Kharj in the southeast, and lasts for approximately 1200 kilometres...

, another of Saudi Arabia's most important road links in the centre of the country at 24°45′40"N 46°38′49"E . The highway begins at Jeddah at 21°26′56"N 39°15′32"E linking with Highway 5 and ends in Dammam at 26°21′9"N 50°1′55"E.
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