It is one of the two islands comprising the whole municipality.

By 1915, the company had gained control of the land that now comprises the municipality.

In 1900, the county comprised the following municipalities and population:

The regional district comprises seven municipalities and four electoral areas.

It comprised 23 municipalities with a total area of 724 km2:

The city also comprises the only municipality of the district of the same name.

Apart from the town itself, it also comprises 7 subordinated municipalities.

The modern day province comprises 10 comarcas and 202 municipalities.

Even so, it is widely accepted to comprise the following municipalities:

Most of the land comprising the municipality is farmland, it does however contain a few settlements.