On my middle earth map there is no Umbar, just the "city of the corsairs". Then when looking online I came across a middle earth map that cited Umbar as a region rather than a city.
So my question is: is Umbar a city or a region?
From the Lord of the Rings appendices, first we read:
Umbar is made into a great fortress of Númenor.
King Eärnil I takes Umbar, which becomes a fortress of Gondor
King Ciryandil slain in the siege of Umbar.
These suggest that it is a walled fortress-city, which we know from elsewhere is also a port-city.
However, in a footnote to the appendices we also read:
The great cape and land-locked firth of Umbar had been Númenorean land since days of old...
Which suggests that the name Umbar was also used of the region containing the city.