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Harrat ar Rahah is the northernmost of a series of young basaltic volcanic fields in western Saudi Arabia arranged parallel to the Red Sea. It is located south of the Plain of El-'Hisma, south of the town of Tabuk.
The field contains mainly large olivine-bearing basalt lava flows that were erupted from fissures. The age of the last eruptions is unknown, but probably less than 10,000 years.
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