water mena region groundwater arab region asr mar hydrogeology groundwater quality water quality mena un environment wwqa coastal aquifer bgr subsol gcc sustainable development un escwa sdgs unep sadc-gmi sadc fmd kwr uae bahrain oman water resources brackish saline security availibility uses transboundary water challenges shared water policy science cooperation sdg6 lebanon drought preparedness middle east scarcity water mena un escwa water science mena un escwa cooperation
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