"Plain mountains" is not a commonly used term in geography or geology. It could potentially refer to mountains that have relatively flat or level surfaces on top, but without more context it is unclear what specifically is being referred to.
Appalachian mountains
The Vindhya Range low mountains divide the Narmada River basin from the Indo-Gangetic plain.
The colonists referred to the foothills between the Appalachian Mountains and the Atlantic Coastal Plain as the Piedmont region.
The West Siberian Plain lies east of the Ural Mountains. It is one of the largest flat areas in the world, covering over 2.6 million square kilometers.
The Ural Mountains separate the Northern European Plain from the West Siberian Plain and serve as the traditional boundary between Europe and Asia. The range extends from the Arctic Ocean to the Ural River in Kazakhstan.
Appalachian mountains
applachian mountains
No, Oman has a narrow coastal plain, but mountains inland and desert inland of those mountains.
There are no mountains in Sydney itself. However, the Blue Mountains, located to the west of Sydney, are a popular mountain range that offers outdoor activities and stunning landscapes.
Coastal Plain
the Hindu Kush Mountains
a plain
The Rocky Mountains.
Plain plateaus and mountains all involve landforms that rise above surrounding areas. While plateaus have flat tops and elevated edges, mountains have peaks and steep slopes. Both landforms can be formed by geological forces such as tectonic movements or volcanic activity.
A plain.
They both are in between of mountains and hills
The state of North Carolina is separated into 3 regions. These regions are the Coastal Plain, the Piedmont, and the Mountains.