Bahrain, officially the Kingdom of Bahrain, is a borderless island nation in the Persian Gulf. Saudi Arabia lies to the west and is connected to Bahrain by the King Fahd Causeway and Qatar is to the south across the Persian Gulf. The Qatar–Bahrain Friendship Bridge, currently being planned, will link Bahrain to Qatar as the longest fixed link in the world.Bahrain is the smallest, in terms of population, Arab nation in the world, and the smallest Arab member of the United Nations.