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The Hajar Mountains in northeastern Oman, are the highest mountain range in the eastern Arabian peninsula. They separate the low coastal plain of Oman from the high desert plateau, and lie 50–100 km inland from the Gulf of Oman coast.

The mountains begin in the north, forming the Musandam peninsula. The central section of the Hajjar is the Jebel Akhdar (9,834 feet (2,980 m), the highest and wildest terrain in the country. The mountains extend for 500 km in total.
The low coastal land north and east of the Jebel Hajjar is named Al Batinah Region (the belly), and the terrain inland of the mountains is Ad Dhahirah (the back).

The mountains are an important eco-region, the only habitat in eastern Arabia above 2,000 m elevation. The climate is cool and wet from December to March and warmer but still with occasional rain from April to September.

Partial Wikipedia quote