Bahrain has a total area of 665 km² (266 mi²), which is slightly larger than the Isle of Man, though it is smaller than the nearby King Fahd International Airport near Dammam, Saudi Arabia (780 km² or 301 mi²). As an archipelago of thirty-three islands, Bahrain does not share a land boundary with another country but does have a 161-kilometre (100 mi) coastline and claims a further twelve nautical miles (22 km) of territorial sea and a twenty-four nautical mile (44 km) contiguous zone. Bahrain's largest islands are Bahrain Island, Muharraq, Umm an Nasan, and Sitrah. Bahrain has mild winters and very hot, humid summers.

Bahrain's natural resources include large quantities of oil and natural gas as well as fish stocks. Arable land constitutes only 2.82% of the total area. Desert constitutes 92% of Bahrain and periodic droughts and dust storms are the main natural hazards for Bahrainis.

Environmental issues facing Bahrain include desertification resulting from the degradation of limited arable land, coastal degradation (damage to coastlines, coral reefs, and sea vegetation) resulting from oil spills and other discharges from large tankers, oil refineries, and distribution stations, and illegal land reclamation at places such as Tubli Bay. The agricultural and domestic sectors' over-utilization of the Dammam Aquifer, the principal aquifer in Bahrain, has led to its salinization by adjacent brackish and saline water bodies.