New Zealand markets itself abroad as a "clean, green" adventure-playground (Tourism New Zealand's main marketing slogan, "100% Pure New Zealand", reflects this) with typical tourist destinations being nature areas such as Milford Sound, Abel Tasman National Park and the Tongariro Alpine Crossing; while activities such as bungee jumping or whale watching exemplify typical tourist attractions, often marketed primarily to individual and small-group travellers. Australia is by far the largest source of New Zealand's international tourists (about 45%), due to its close proximity (3-4 hours by plane) and traditional good relations. Mainland China, the United States and the United Kingdom are the next three largest markets.