Oman
A chain of cool pools ends at a waterfall hidden inside a keyhole chamber.
The outing begins with a short boat crossing, then a stony path threads between limestone walls and date palms. Water appears in stages, ending in deep pools that belong to confident swimmers.
Wadi Shab starts with a boat crossing and a stony path between limestone walls and date plantations, and ends, for confident swimmers, in a chain of pools leading to a waterfall hidden inside a keyhole chamber. The water stays cool all year, the reason the canyon works at forty degrees in summer. Non-swimmers get a genuine canyon walk and turn back at the water. Rain closes the wadi for the day and the day after.
Friends
Tackle the canyon path as a group, agreeing before the pools who will swim and who will enjoy the dry route back.
Solo
Join a guide or shared outing for the hike; treat the deep-water section as optional and enter it only with competent company.
Couple
Make the limestone walk the heart of the outing, adding the inner pools only when both swimmers are capable and conditions are sound.
Nothing is sold inside the wadi, so lunch and snacks travel in with you.
The plate this walk earns is grilled fish with rice in Sur, the fishing town down the coast.

Wadi al-Gemal
Egypt
Red desert wadis spilling into turquoise sea, Ababda nomads herding camels on empty shore.

Kullaberg Nature Reserve
Sweden
Sea caves and porpoise pods along a dramatic headland where Skåne plunges into the Kattegat.

Espíritu Santo Island
Mexico
Red volcanic cliffs fold around clear coves reached by boat from La Paz.

Isla Coiba
Panama
Fishing was banned to stop prisoners escaping; the reef has been thriving ever since.

Jebel Shams
Oman
The rim path hangs above a thousand metres of air, Egyptian vultures working the thermals below.

Empty Quarter Edge
Oman
The largest continuous sand desert on Earth begins where Dhofar's gravel plains give out.

Wadi Bani Awf
Oman
A rough 4WD road threads villages, canyon walls and the mouth of Snake Gorge.

Jebel Samhan
Oman
Camera traps on these cliffs still catch the Arabian leopard; visitors almost never do.