Definition
Castilla is the Spanish spelling of Castile, a historical region in central Spain. It's essentially the same as 'Castile,' just in its native language. Think of it as the original term for a land known for its castles and historical significance. Castilla is the heartland of the Spanish language and played a crucial role in the formation of modern Spain. The term 'Castilla' is more commonly used in Spanish-speaking contexts.