Canada is a country in the northern part of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres (3.85 million square miles), making it the world's second-largest country by total area and the fourth-largest country by land area. Canada's border with the United States is the world's longest binational land border. The majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its land territory being dominated by forest and tundra and the Rocky Mountains. It is highly urbanized with 82 per cent of the 35.15 million people concentrated in large and medium-sized cities, many near the southern border. One third of the population lives in the three largest cities: Toronto, Montreal and Vancouver. Around 25 million tourists visited Canada in 2015, these tourists came for many different reasons, winter sports is a big draw and there are many resorts that cater to this. During the summer months there are many festivals throughout the cities and also in the winter resorts.