Related topics: Geography
up‧per1 W2 [only before noun]
in a higher position than something else [≠ lower]:
the upper lip
near or at the top of something [≠ lower]:
the upper floors of a building
There is an upper age limit for becoming a pilot.
to have more power than someone else, so that you are able to control a situation:
Police have gained the upper hand over the drug dealers in the area.
more important than other parts or ranks in an organization, system etc:
the upper echelons (=the most important members) of corporate management
further from the sea or further north than other parts of an area:
the upper reaches of the Nile