Hijaz Mountains, with sunset over the Red Sea.
|Elevation||2,100 m (6,900 ft)|
The western coastal escarpment of the Arabian Peninsula is composed of two mountain ranges, the Hijaz Mountain to the north and the Asir Mountains farther south, with a gap between them near the middle of the peninsula's coastline. From an elevation of 2,100 metres (6,900 ft), the range declines towards the vicinity of the gap about 600 metres (2,000 ft),
The mountain wall drops abruptly on the western side toward the Red Sea, leaving the narrow coastal plain of Tihamah. The eastern slopes are not as steep, allowing rare rainfall to help create oases around the springs and wells of the few wadis.
River — wadi
The Hijaz Mountains have been conjectured as the source of the ancient Pishon River, that was described as one of the four rivers associated with the Garden of Eden. This is a component in the research of Juris Zarins that locates the Garden of Eden at the northern tip of the Persian Gulf near Kuwait.
The course of the now dried up river, the modern-day Wadi Al-Rummah and its extension Wadi Al-Batin, was identified by Farouk El-Baz of Boston University and named the 'Kuwait River.' This tracks northeast across the Saudi desert for 600 miles (970 km), following Wadi Al-Batin to the Gulf. The 'Pishon' or 'Kuwait River,' and the Hejaz region ecology, is estimated to have dried up 2,500–3000 years ago.
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- Asir Mountains — coastal range on south.
- Sarawat Mountains — coastal range further south.
- Mount Paran
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