The Qatar–Saudi Arabia border is 87 km (54 mi) in length and runs from the Gulf of Bahrain coast in the west to the Persian Gulf coast in the east.
The border begins in the west at the Gulf of Salwah, proceeding overland via 4-5 straight lines (maps differ on the precise depiction) which forms a broad arc, terminating in the east at the Khawr al Udayd coast.
Qatar–United Arab Emirates border

Map of the United Arab Emirates showing the pre-1974 boundary; note that by this map the UAE borders Qatar
Prior to the signing of the 1974 Treaty of Jeddah between Saudi Arabia and the UAE there was some confusion as to whether Qatar shared a border with the UAE, with maps commonly depicting a long Emirati panhandle touching Qatar. This Treaty gave Saudi Arabia access to the Khawr al Udayd, thereby removing any the possibility of Qatar sharing a border with the UAE.[2]

Historically there was no clearly defined boundary in this part of the Arabian peninsula.[citation needed] From 1868 Britain exercised control over Qatar as a de facto protectorate, formalized as such in 1916.[3][4] The interior of Arabia consisted of loosely organized Arab groupings, occasionally forming emirates, most prominent of which was the Emirate of Nejd and Hasa ruled by the al-Saud family.[5] Britain and the Ottoman Empire theoretically divided their realms of influence via the so-called 'Blue' and 'Violet lines' in 1913–14.[6][7]

During the First World War an Arab Revolt, supported by Britain, succeeded in removing the Ottomans from much of the Middle East; in the period following this Ibn Saud managed to expand his kingdom considerably, eventually proclaiming the Kingdom of Saudi Arabia in 1932. Ibn Saud refused to recognize the Anglo-Ottoman lines and lay claim to large parts of the eastern Arabian hinterland (the so-called ‘Hamza line’)
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