Of all the aflaj in Oman and the UAE, only one that I saw in 2010 is included in this WHS. That is the falaj al Muyassar that flows through Rustaq, and beneath the fort (on WH tentative list). The portion I have seen flows through a date plantation, then beneath the fort, and in an open channel out into Rustaq village. It then continues in an open channel through the village.

In 2011, while staying in Nizwa I visited several others, at Falaj Daris, at a spot where steps are provided for washing prior to attending mosque. The Falaj Al-Khatmeen was easily located at Birkat Al Mawz in a date plantation adjacent to the fort. Less easy to find was Falaj Al-Malki, located in what is now a new housing estate. It was not in a very clean state either.