It is bordered by the provinces of Valencia to the south, Teruel to the west, Tarragona to the north, and by the Mediterranean Sea to the east.

[3] The province, and in particular its idle large airport, has become a symbol of the wasteful spending prior to the 2008-14 Spanish financial crisis.

[4] The historical population is given in the following chart: Traditionally, the economy of Castellón has been focused on the production of citrus and vegetables (Nules and Benicarló).

The largest seaside and beach resorts include Benicàssim, Orpesa, Vinaròs, Borriana, Peníscola, Benicarló, etc.

There are opportunities for rural tourism in the interior, as well as monumental towns like Morella, Vilafamés, Sant Mateu, Segorbe, mineral springs at Montanejos, Benassal, Catí, etc.