Tulsa is the city located in the north-eastern side of Oklahoma, next to the scenic Arkansas River. This city is also known as the second-largest city in the state of Oklahoma and the forty - fifth - largest city in the United States. Situated near the heart of Tornado Alley with a wetter climate than points westward, Tulsa has a duty as a gateway to "Green Country", a popular and official designation for northeast Oklahoma. Also, this place is the most topographically diverse part of Oklahoma because of containing seven of Oklahoma's 11 eco-regions and more than half of its state park. For those travelers who love natural beauty and want to explore the wonders of nature, Tulsa city is an interesting place to come to.