One does not use the with the names of continents.
For simple names of countries and states, the is not used, but it is used when republic, union, statesor kingdom are included in the name.
The is also used with plural names.
The is not used , except for The Hague
Madrid is the capital of Spain
With Islands
Groups of islands usually have plural names and the is used, but for individual islands with singular names , the is not used
With Regions
With the north, the south, the west, the east, the Far East or the Middle East one uses the. However with northern Spain, southern France etc. one does not use the.
Mountain ranges usually haave plural names and take the, but individual mountains don’t usually take the.
Lakes usually don’t take the
How big is Lake Victoria?
Oceans, seas, rivers and canals take the.