Shared Water Resources in Oman May 7, 2018 There are no water agreements in place for the southern part of the Umm er Radhuma-Dammam aquifer system, which is shared between Oman, Saudi Arabia, the UAE and Yemen. Tags: Fanack Water - Muscat - Oman - shared water resource - Treaties and Agreements - Umm er Radhuma-Dammam aquifer - Water