They can be, but don't have to be.
mountains and ocean coasts
Lunar mare
The Rocky Mountains separate the Pacific Coastal region from the Great Plains. This mountain range runs from northern British Columbia in Canada down to New Mexico in the United States.
receding coasts in Mexico
Chennai
mountains and ocean coasts
The Sahara
western ghats
western ghats
it is tropical along the coasts and colder in the high mountains
Mountains (the higher ones in the north), valleys, hills, little plain (mostly along the coasts).
Lunar mare
All along the west and south coasts of South America, the Andes are a barrier to movement in interior. As a result, more settlement in South America has occurred along the eastern and northern coasts.
The Atlas mountains, Casablanca, Agadir, Marakech, the western reaches of the Sahara, the extensive coasts, ancient walls and fortifications.
The east coast of Canada and the US is generally flatter with more plains compared to the west coast, which is typically mountainous. However, there are some mountainous regions along the east coast, such as the Appalachian Mountains in the US and the Long Range Mountains in Canada.
because the bloody are
The Southern part of Germany has a higher elevation.