Are both Doñana National Park and Guadarrama National Park areas of marshes, streams, and sand dunes?
Guadarrama National Park Sierra de Guadarrama National Park (in Spanish: "Parque Nacional de la Sierra de Guadarrama") is a national park in Spain, covering nearly 34,000 hectares, the fifth largest in Spain's national parks system. The Guadarrama mountain range ("Sistema Central") contains some ecologically valuable areas, located in the Community of Madrid and Castile and León (provinces of Segovia and Ávila). The law that regulates the recently approved national park was published in the BOE in  26, 2013 (2013--) .
Fort Ord Dunes State Park Fort Ord Dunes State Park is a state park of California, USA, along 4 mi of coastline on Monterey Bay and created from part of the now-closed Fort Ord. The park includes a boardwalk, a path to the beach, a 4 mi road for walking and biking, and interpretive exhibits describing its former use as a military training area. As the dunes are a nesting area for sensitive species, public access is limited to the paths and trails.