Practically speaking, the Spanish language exists outside of any one person's or government's ability to regulate it. When you have 343 million native speakers across five continents, regulation is basically impossible.
However, Spain does have the official "Real Academía Española" (The Royal Spanish Academy) whose members convene to discuss what the proper grammar should be for the Spanish Language, what new words will be accepted into the official Spanish lexicon, and numerous other Spanish language considerations. The Real Academía writes a summary of its meetings and "findings" for the public in order for them to speak Spanish as they believe proper.
Spain = españa
maintain Spanish control of the Netherlands.
Basque is the only language in Spain that is not related to Spanish or Portuguese.
Spanish Spain
Spanish is the third most spoken language in the world. It began in Spain and now 500,000,000 people around the world speak is as their native language.
Spanish is the language spoken in the country of Spain.
Spain
Spain.
If you are speaking in (the language) Spanish it is Spanish. The national language spoken in Spain is Spanish.
The people from Spain (Spanish) spoke Spanish.
Spain is in Europe and they speak spanish.
Cuba's language is Spanish, from Spain.