Castell d'Aro is located in the heart of the Costa Brava, 80 km north of Barcelona. It borders with Calonge to the north, Santa Cristina d'Aro to the west, Sant Feliu to the south and the Coast to the East.

Castell-Platja d'Aro occupies the eastern end of the Vall d'Aro, a narrow plain drained by the river Ridaura and located between the Mountain ranges of Cadiretes and southern end of the Gavarres.

Platja d'Aro was originally a small fishing village on the highway between Palamós and Sant Feliu de Guíxols with a 2 km long beach. It is now a major tourist resort with hotels and other commercial premises.

The outskirts of Castell-Platja d'Aro include a number of urbanisations including Mas Nou which offers spectacular views over the coast and a championship golf course.

Along the coast connecting the main beach with numerous small beaches is the Camí de Ronda.