Wadi Siji is a seasonal watercourse in the Hajar Mountains of Fujairah, in the United Arab Emirates.

[4] In 2001, UAE President Sheikh Zayed Al Nahyan ordered the construction of a further three dams at Siji, providing water resources for 312 homes and 210 farms in the area as part of a Dhs250 million national water infrastructure development project.

[2] The village is the location of the Siji Societal Majlis, opened in 2017 by the Crown Prince of Fujairah,[6] one of a number of government investments in rural infrastructure that have improved communications, access and facilities.

[9] A number of quarries and crushers are located throughout Wadi Siji and the surrounding mountains.

[10] The remains of old copper workings are also to be found in the area, particularly in the tributary Wadi Ashwani.