The Hajar Mountains are a range of about 700 kilometres and roughly 100 kilometres wide, on the north-east corner of the Arabian Plate, running from the Musandam Peninsula in the north to Oman's east coast, according to Wikipedia. The name, Jibal al-Hajar (جبال الحجر), is usually translated as the Rocky or Stone Mountains. The UAE holds only the northern part. Bayut's guide lists Ras Al Khaimah, Fujairah, Sharjah and Dubai among the emirates the range extends into, and the highest point of the whole range, Jebel Shams at 3,009 metres, is in Oman. UAE heights are lower: Jebel Jais is quoted at 1,934 metres by Visit Ras Al Khaimah, although Wikipedia says its summit sits on the Omani side and gives 1,892 metres for the highest point inside the UAE.
The rock is the reason the range is of interest to geologists. The Semail Ophiolite here is described as the most complete ophiolite on Earth: a slice of ancient ocean floor pushed up onto the continent tens of millions of years ago. At Wadi Wurayah in Fujairah it is exposed at the surface. At Wadi Naqab, Wikipedia says the rock exposes the Triassic to Jurassic boundary, about 200 million years old, with abundant fossils.
From the UAE, the range is best understood as a set of separate entry points rather than one destination. In Ras Al Khaimah, Jebel Jais is the developed one, with a zipline, a restaurant and marked hiking trails, while Wadi Naqab and the Jebel Yanas ridge above it are rougher and more demanding; Bayut also lists Wadi Bih and Wadi Shawka in the emirate. In Fujairah, the mountains run close to the east coast, and Wadi Wurayah is the best-documented site: the UAE's first national park (2013), a Ramsar wetland (2010) and, according to The National, added to the UNESCO World Heritage List in July 2026. Bayut also names Wadi Al Hayl and Wadi Siji in Fujairah. Hatta, a mountain exclave of Dubai, has its own page. Jebel Hafeet, near Al Ain, is often considered an outlier of the Hajar rather than part of the main range, and its rock is different: a fold of limestone, marl and evaporites.
The practical points are weather and timing. Jebel Jais is usually about 10°C cooler than other parts of Ras Al Khaimah, and Wikipedia gives it an average annual rainfall of 129mm. Rain is the main hazard: the National Centre of Meteorology warned of flash floods and landslides in the Fujairah and Masafi hills in October 2025, and Gulf News reported rocks falling on mountain roads there. Visit Ras Al Khaimah says summer is unsuitable for hiking at Wadi Naqab because of the heat, and puts the season at October to April.
