It may look nice but the water might contain the Schistosomiasis parasitic worm; giving a disease commonly known as bilharzia. The way to avoid this nasty little critter is by not going into the water with bare feet, swimming, washing & certainly not drinking it. I will add here that due to the work of the Ministry of Health its prevalence in the only risk area here in Oman, Dhofar; now ≤ 1% according to the latest reports I can find, but better safe than sorry.
A 500ft high Travertine Curtain blocking the exit from Wadi Darbat. It should really be referred to as Tufa, a precipitate of water containing dissolved carbonate minerals. As the water evaporates it deposits the carbonates that form this spectacular cliff face. During the monsoon period, this can quite often be hidden behind a deluge of water.