Sam Phan Bok”, is a canyon by the Mekong River. When you first get to Sam Phan Bok, you can’t help but think of “The Grand Canyon” in Arizona, USA. Although they look nothing alike, the similar rock formation of the Grand Canyon and Sam Phan Bok is the reason why the catchphrase of Sam Phan Bok is “The Grand Canyon of Siam, Sam Phan Bok of Ubon”. However, this is not what makes Sam Phan Bok a natural wonder. Take a look at the pictures to see what im talking about.