Munozara:Castillo de Aro
Excuse me for writing in English.
The only oficial name of this town is Castell-Platja d'Aro, not Castillo de Aro. Watch any other Wikipedia and you will see that the only one using Castillo de Aro is the Spanish Wikipedia.
See official Spanish cities and villages names on Spanish Statistical Institute http://www.ine.es/daco/daco42/codmun/codmun15/15codmun17.xls.