The King Fahd Causeway links Bahrain to which country?

The King Fahd Causeway links Bahrain to Saudi Arabia.

The crossing runs for about 25 kilometres across the Gulf of Bahrain, connecting Al Jasra on Bahrain’s main island with Khobar on Saudi Arabia’s eastern coast. It is a road connection rather than a single conventional bridge: the route combines several bridges, reclaimed embankments, and artificial islands.

Construction formally began in 1982, and the causeway opened on 26 November 1986. Its five bridges rest on 536 concrete pylons, while seven embankments carry the road through shallower water. The largest artificial embankment, often called Passport Island or Middle Island, contains customs, immigration facilities, mosques, gardens, and restaurants.

The structure was named for King Fahd bin Abdulaziz Al Saud of Saudi Arabia. It is sometimes confused with proposed Gulf links involving Qatar or Oman, but the operating international road causeway in this question is specifically the Bahrain–Saudi Arabia connection.