With an area of ​​almost 630 hectares, the El Regajal-Mar de Ontígola Nature Reserve (Reserva del Regajal-Mar de Ontígola) habitat brings together a characteristic fauna of the Mediterranean-sub-desert mountains, with species such as hare, rabbit, wild boar, tawny owl, partridge and blackbird being very common. The gypsum hills with endemic flora species and unique vegetation and are populated with species such as kermes oak and rosemary are well preserved.

The Fauna Refuge of San Juan Lagoon (Refugio de fauna de la Laguna de San Juan) covers an area of 40 hectares and is found along the lower course of the River Tajuña. It is an important wetland area close to the town of Chinchón and one of the largest bird reserves in the Community of Madrid.

• Region: Madrid
• Declared a protected area: 1974
• Park surface area: 250 hectares
• Towns and villages: Montejo de la Sierra

The hayedo Montejo beech forest is located on the slopes of the Sierra de Ayllón and is protected as a Natural Site of National Interest. It is a site of Community Importance (SCI) of Alto Lozoya and is also included within the limits of the the Sierra del Rincón Biosphere Reserve.

• Region: Madrid
• Declared a Regional Park: 1994
• Park surface area: 31,552 hectares
• Towns and villages: Velilla de San Antonio, Ciempozuelos, Titulcia, Rivas-Vaciamadrid, San Martín de la Vega, Morata de Tajuña, Arganda del Rey, San Fernando de Henares, Pinto, Mejorada del Campo, Getafe, Valdemoro, Aranjuez, Chinchón, Torrejón de Ardoz, Coslada and Madrid

Points of interest

The South East Regional Park (Parque regional del Sureste) is an area of Madrid that extends from north to south along the Jarama river and presents a great variety of habitats some of which are considered the best and well preserved wetlands in the Comunity of Madrid such as the Mar de Ontígola close to the town of Aranjuez, Laguna de San Juan near Chinchón and the gravel pits between the rivers Jarama, Manzanares and Henares (Soto de las Juntas and El Campillo).