Is this one of the 77 Wonders of the World ? Yes, no, vote.
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There are “some 3,000 such systems still in use in Oman. The origins of this system of irrigation may date back to AD 500, but archaeological evidence suggests that irrigation systems existed in this extremely arid area as early as 2500 BC. Using gravity, water is channelled from underground sources or springs to support agriculture and domestic use.” More information via the World Heritage Centre.