Stock Photo: The free roaming horses of Maliuc In the Delta horses roam free and sometimes are considered true wild horses With more than 5000km2 the danube delta is the largest wetlands in europe most parts of the danube delta are part of the biosphere reserve, na. The free roaming horses of Maliuc In the Delta horses roam free and sometimes are considered true wild horses With more than 5000km2 the danube delta is the largest wetlands in europe most parts of the danube delta are part of the biosphere