Oman proper ( ) refers to a historical area within the present-day
Sultanate of Oman. It lay inland from
Muscat beyond the
Jebel Akhdar (Green Mountains) and was centered on the city of
Nizwa in the area of the current
region of
Ad Dakhiliyah. Along with Muscat and
Dhofar, it was a constituent part of the Sultanate of
Muscat and Oman, but with the 1970 palace
coup, the term Oman alone was applied to the entire country.