Answer:
Oman
Explanation:
The Al Hajar Mountains, of which the Jebel Akhdar is a part, separate the country into two distinct regions: the interior, known as Oman, and the coastal area dominated by the capital, Muscat.
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Overcrowding and slums developed in many impoverished countries in the 20th century, mostly due to large migrations to cities from people looking for work.