La Murta i la Casella, Natural municipal park in Alzira, Spain.

La Murta i la Casella is a protected natural area in Alzira spread across forests and mountain formations between two mountain ranges. The site shows characteristic Mediterranean landscapes with pine trees, shrubs, and rock formations.

The valleys of La Murta and La Casella were declared a municipal natural area by agreement of the Generalitat Valenciana on 5 November 2004. The designation covers 765.64 hectares in Alzira, in the Ribera Alta. Within the area stands the monastery of the Jerónimos, declared a Bien de Interés Cultural, whose consolidated ruins, manor house, aqueduct and pools, and snow well remain.

The name La Murta comes from the myrtle (murta) that grows in one of the two valleys. The other, La Casella, refers to the monastery of the Hieronymites, a listed site whose ruins, manor house with its romantic garden and chapel of the Virgin, aqueduct and water tanks, and snow well can still be visited. Since 2008 the monastery is a stop on the Route of the Monasteries of Valencia.

The park covers 765.64 hectares in the municipality of Alzira, in the Ribera Alta. Paths lead from the monastery of La Murta up to viewpoints such as the Cavall Bernat, the Creu del Cardenal, the Ratlla and the l'Ouet forest observatory, from which much of the Ribera Alta and Baixa can be seen. The monastery complex, with its aqueduct, pools and snow well, is a designated Bien de Interés Cultural.

The name La Murta comes from the myrtle (murta) that grows in one of the two valleys; the other, La Casella, gives the protected area its second name. The park was declared by agreement of the Generalitat Valenciana on 5 November 2004.