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In page Transport in Bahrain:

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The four main islands and all the towns and villages are linked by well-constructed roads.[citation needed] There were 4,122 km (2,561 mi) of roadways as of 2010, of which 3,392 km (2,108 mi) were paved.[2] Multiple causeways stretching over 2.8 km (2 mi), connect Manama with Muharraq Island, and the Sitra Causeway joins Sitra to the main island. A four-lane highway atop a 24 km (15 mi) causeway, linking Bahrain with the Saudi Arabian mainland via the island of Umm an-Nasan was completed in December, 1986, and financed by Saudi Arabia.