There is indeed something particularly awe-inspiring about coming across an oasis in a barren landscape. The contrast between lush greenery and bare rock or soil can be so striking. Wadi Bani Khalid is one of the best-known and most accessible of Oman’s wadis. But the small amount of development here has been done sensitively and it doesn’t detract from the visual impact of deep green waters, lush date plantations and stark mountains all around.