Pronouncing C and Z in Castilian Spanish

In most of Spain (Castilian Spanish):

• C (before e/i): Soft "th" as in "think" (e.g., casa → "cah-sa").
• Z: Soft "th" as in "think" (e.g., zapato → "thah-pah-to").

In some Andalusian regions, C and Z may be pronounced as a hard "s" (seseo).