Bahrain, officially the Kingdom of Bahrain is a small island country situated near the western shores of the Persian Gulf. It is an archipelago of 33 islands, the largest being Bahrain Island. 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 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. Due to the Persian Gulf area's low moisture, summers are very hot and dry. The seas around Bahrain are very shallow, heating up quickly in the summer to produce high humidity, especially at night. Summer temperatures may reach up to 50°C (122°F) under the right conditions. Rainfall in Bahrain is minimal and irregular. Rainfalls mostly occur in winter, with a recorded maximum of 71.8 mm (2.83 in).