4. United States
The country has some serious long distance trails to offer, such as the Coast-to-Coast trail which is 10,900 km long and passes through 14 National Parks. The Pacific Crest Trail of 4,271km, the Appalachian Trail of 3.518 km and the John Muir Trail of 3400 km are the longest trails in US.
The National Parks in the US are also perfect for anyone craving for good hiking. Among all the states, Hawaii offers some spectacular trails one of its famous trail is the Kalalau Trail on the Na Pali Coast in Kauai Hawaii.