The Veneto region of northern Italy is well known for the Venetian lagoon and city, but around one third of the area is mountainous and contains parts of three mountain ranges. The Dolomites, Alps and Venetian Prealps are all found in the area with the Marmolada mountain in Veneto the highest in the region at over 3,000 metres with the mountain well known for the difficulty of climbing both the north and south faces. The Prealps are one of the most beautiful areas of Veneto with the long rolling mountains often filled with snow on the winter slopes of the area that rise to a height of over 2,400 metres. Perhaps the most famous mountain range in Veneto are the Dolomites, which are well known for being a UNESCO World Heritage Site and offer tourist activities throughout the summer and winter months. Alongside winter sports the Dolomites are also well known for the mountain biking, hiking and climbing opportunities that are available in one of the most popular tourist areas of Italy.