Bahrain is an archipelago of 33 islands, the largest 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. 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.
Bahrain is believed to be the site of the ancient land of the Dilmun civilisation. Bahrain came under the rule of successive Persian empires, the Parthians and Sassanids empires respectively. Bahrain was one of the earliest areas to convert to Islam in 628 AD. Following a successive period of Arab rule, the country was occupied by the Portuguese in 1521. The Portuguese were later expelled, in 1602, by Shah Abbas I of the Safavid empire. In 1783, the Bani Utbah tribe captured Bahrain from the Persians and was ruled by the Al Khalifa royal family since, with Ahmed al Fatehbeing the first hakim of Bahrain. In the late 1800s, following successive treaties with the British, Bahrain became a protectorate of the United Kingdom. Following the withdrawal of the British from the region in the late 1960s, Bahrain declared independence in 1971. Formerly a state, Bahrain was declared a kingdom in 2002. Since early 2011, the country has experienced sustained protests and unrest inspired by the regionalArab Spring.
Oil was discovered in Bahrain in 1932 (the first in the Arabian side of the Gulf). In recent decades, Bahrain has sought to diversify its economy and be less dependent on oil by investing in the banking sector and tourism. The country's capital, Manama, is home to many large financial structures, including the Bahrain World Trade Center and the Bahrain Financial Harbour. The Qal'at al-Bahrain (the harbour and capital of the ancient land of Dilmun) and the Bahrain pearling trail were declared UNESCO World Heritage Sites in 2005 and 2012, respectively. The Bahrain Formula One Grand Prix takes place at the Bahrain International Circuit.