Wadi Shab and Bimmah Sinkhole

Wadi Shab and the Bimmah Sinkhole form Oman's classic coastal day trip from Muscat, strung along Route 17, the Muscat-Sur coastal highway in Ash Sharqiyah South Governorate. Wadi Shab, near Tiwi, is about 140 km from the capital and the drive takes roughly 1h45. The Bimmah Sinkhole (Hawiyat Najm Park) lies about 25 km before it. No public bus stops at either site, so visitors use a hire car, a private driver at roughly OMR 50-80 (USD 130-208) per car, or an organised day tour at about OMR 45-60 (USD 117-156) per person. The Bimmah Sinkhole is a deep turquoise limestone sinkhole with a staircase and swim ladder where swimming is allowed, and it makes a natural first stop on the way. Wadi Shab is the main event. From the car park at Tiwi, a short boat crossing of the wadi mouth costs about OMR 1 (USD 2.60) return, after which a walk of roughly 45 minutes follows the water upstream past palms, small villages and green pools. The route finishes at a cave pool with a hidden waterfall that is reached by a short swim, so the day involves real exertion. A suggested arc is to leave Muscat around 6 am, swim at the sinkhole when it is quiet, reach Wadi Shab by about 9 am before the heat builds, spend two to three hours walking and swimming, then lunch at a roadside cafe in Tiwi or Bimmah before heading back in the afternoon. The best months are October to April; after heavy rain the wadi can flood and become dangerous, so conditions should be checked before setting out. Both sites are free to enter, but visitors should bring cash for the boat and parking. Sturdy water shoes, a dry bag for phones and modest swimwear, such as a T-shirt and shorts, are recommended, in keeping with local norms. Snacks and water are best brought along, since facilities are limited beyond the car park.