Russia
Kolyma Mountains
The Pensacola Mountains are located in Antarctica.
The small country located in the Pyrenees mountains is Andorra.
The region located south of the Caucasus Mountains is the country of Armenia.
Belgium
Bulgaria and Serbia.
The Jura mountains are located in Eastern France and extend into Switzerland in Western Europe.
The northern mountains can be found in the north of a country. Which country is not stated in the question - need more information!
Eastern Half of the Country.
Medellín is located in Colombia. It is the second-largest city in the country and is situated in the Andes Mountains.
The Pamir Mountains are primarily located in Tajikistan, but the mountains continue into Afghanistan, Pakistan (Jammu/Kashmir), and China.