The four main islands and all the towns and villages are linked by well-constructed roads. There were  of roadways in 2002, of which  were paved. A causeway stretching over , connect Manama with Muharraq Island, and another bridge joins Sitra to the main island. The King Fahd Causeway, measuring , links Bahrain with the Saudi Arabian mainland via the island of Umm an-Nasan. It was completed in December 1986, and financed by Saudi Arabia. In 2008, there were 17,743,495 passengers transiting through the causeway.