The King Fahd Causeway is a 25 km long series of bridges and causeways connecting Khobar, Saudi Arabia and Al Jasra, Bahrain.
Its five bridges rest on 536 concrete pylons, with seven embankments in the Gulf's shallower water. One of the embankments, known as Middle Island has been converted into a sizeable artificial island with customs and immigration facilities, a mosque and gardens and fast food restaurants. Another island towards the end of the causeway belongs to Bahrain and is simply known as Mother of Sleepiness.
Wikipedia https://en.wikipedia.org/wiki/King_Fahd_Causeway
Coordinates 26°10'54.072" N 50°21'15.602" E