To the west, the coast is shallow and sandy, with numerous tourist resorts and the lagoons of Grado and Marano Lagunare. To the east, the coastline rises into cliffs, where the Karst plateau meets the Adriatic, all the way to Trieste and Muggia on the border with Slovenia. The Carso has geological features and phenomena such as hollows, cave networks and underground rivers, which extend inland in the provinces of Trieste and Gorizia, with an altitude ranging between 300m and 600m.