Geography
Bahrain is a generally flat and arid archipelago in the Persian Gulf, east of Saudi Arabia. It consists of a low desert plain rising gently to a low central escarpment with the highest point the 134 m (440 ft) Mountain of Smoke (Jabal ad Dukhan). Bahrain had a total area of 665 km2 (257 sq mi) but due to land reclamation, the area increased to 767 km2 (296 sq mi), which is slightly larger than the Isle of Man.
As an archipelago of thirty-three islands, Bahrain does not share a land boundary with another country but does have a 161 km (100 mi) coastline. The country also claims a further 22 km (12 nmi) of territorial sea and a 44 km (24 nmi) contiguous zone. Bahrain's largest islands are Bahrain Island, Muharraq Island, Umm an Nasan, and Sitrah. Bahrain has mild winters and very hot, humid summers. The country's natural resources include large quantities of oil and natural gas as well as fish in the offshore waters. Arable land constitutes only 2.82% of the total area.
92% of Bahrain is desert with periodic droughts and dust storms 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, distribution stations, and illegal land reclamation at places such as Tubli Bay. The agricultural and domestic sectors' over-utilisation of the Dammam Aquifer, the principal aquifer in Bahrain, has led to its salinisation by adjacent brackish and saline water bodies. A hydrochemical study identified the locations of the sources of aquifer salinisation and delineated their areas of influence. The investigation indicates that the aquifer water quality is significantly modified as groundwater flows from the northwestern parts of Bahrain, where the aquifer receives its water by lateral underflow from eastern Saudi Arabia, to the southern and southeastern parts. Four types of salinisation of the aquifer are identified: brackish-water up-flow from the underlying brackish-water zones in north-central, western, and eastern regions; seawater intrusion in the eastern region; intrusion of sabkha water in the southwestern region; and irrigation return flow in a local area in the western region. Four alternatives for the management of groundwater quality that are available to the water authorities in Bahrain are discussed and their priority areas are proposed, based on the type and extent of each salinisation source, in addition to groundwater use in that area.
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