Although also called Islas Tres Marías, meaning the “Three Marías, ” the archipelago officially comprises four islands, three of which are uninhabited.
Kuigi seda saarestikku on kutsutud ka nimega Islas Tres Marías ehk Kolm Mariat, kuulub ametlikult selle koosseisu neli saart, millest kolm on asustamata.