Bahrain (i/bɑːˈreɪn/; Arabic: البحرين al-Baḥrayn; Persian: بحرین Bahreyn), officially the Kingdom of Bahrain (Arabic: مملكة البحرين Mamlakat al-Baḥrayn) is a small island country situated near the western shores of the Persian Gulf. It is an archipelago, with the largest island being Bahrain Island at 55 km (34 mi) long by 18 km (11 mi) wide. Saudi Arabia lies to the west and is connected to Bahrain by the King Fahd Causeway. Iran lies 200 km (120 mi) to the north of Bahrain, across the Gulf. The peninsula of Qatar is to the southeast across the Gulf of Bahrain. The planned Qatar Bahrain Causeway will link Bahrain and Qatar and become the world's longest marine causeway (Wikipedia page  refers).
More information on the Wikipedia page