The Falaj Al-Malki is one of the irrigation channels that UNESCO listed in 2006 as part of the aflaj of Oman, and it lies near Izki, in the valley below the great wall of Jebel Akhdar. Izki is an old oasis town with palm groves and a ruined mud-brick quarter, strategically placed at the Sumail Gap, the natural pass that has linked the coast and the interior for thousands of years. Caravans, armies and traders all passed here, and the town has always had its share of tribal rivalries and politics.
The falaj works by a simple principle: water collected from an underground source or a spring flows by gravity along a gently sloping channel, often partly underground, to the village. There are three kinds, distinguished by their source: the daudi type, which taps deep underground water through a tunnel; the ghaili, which draws from a wadi; and the ayni, which comes from a spring. Maintaining them is community work, and water rights are shared by time rather than volume, with each family having a measured slot. A system like this takes real cooperation, and it has endured because it works.
Riding here is wide-open and dramatic. Highway 15 from Muscat runs across the plain to Izki, with the bare, sharp ridges of the Hajar to the north and sandy desert to the south, and the long, empty distances mean the wind and the heat dominate. Midsummer is very hot, with temperatures above forty degrees, so ride early and stop often, drinking plenty of water. The cooler months from late October are much more comfortable, and in winter the nights are fresh.
Izki has about thirty-six thousand people, with petrol stations, small restaurants and shops. Nizwa, over thirty kilometres away, has more choice. A meal of shuwa, meat slow-cooked in an underground oven, is a classic Omani dish, usually prepared for festivals, though you may find something similar in local restaurants. Rest in the shade near the falaj if you can; the sound of running water in a dry country is a quiet but powerful experience, and the oasis can be surprisingly cool even in the heat of the day.