United Arab Emirates
A gravel track climbs between thousand-metre limestone walls towards a border only rock crosses.
The wadi narrows until banded limestone rises on both sides, cream and grey strata recording an ocean floor folded a kilometre into the sky. Past the dams the tarmac gives out, and what remains is gravel under tyres and wind working the walls.
Wadi Bih cuts into the northern Hajar from Ras Al Khaimah's eastern edge towards Oman's Musandam, its slopes climbing towards a full kilometre above sea level. The route in passes two dams, then hardens into genuine boots-and-4x4 territory: abandoned stone structures on the terraces, Barbary falcons overhead, and rock, in every direction, doing all the talking. Hiking, mountain biking, climbing and wild camping all run between the walls, but the wadi grants nothing casually. There are no food stops, GPS and spare water are standard kit, and winter rain can turn the dry bed dangerous in minutes. The old through-route to the coast at Dibba is closed to travellers at the border, so the UAE side is an in-and-back journey. The mountains' racing pedigree survives regardless: the Wadi Bih Run, a mountain relay born here in 1993, still sends teams through Musandam's gorges every year, now staged from the Dibba side.
Solo
Walk in from the dams with a turnaround time agreed with yourself and someone told at home; the terraces and falcon-patrolled walls reward a slow, self-reliant day.
Friends
Take two capable 4x4s, not one, split the driving and the spotting, and camp where the canyon frames a strip of stars; the convoy is the safety margin.
There is no kitchen up the wadi: pack khameer bread, labneh and a flask in Ras Al Khaimah and eat between the walls.
The reward meal waits at sea level, where Eayshat Awal cooks machboos the slow traditional way.

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