Tulsa is the second largest city in the US state of Oklahoma. Currently, more than 410 thousand people live in it. The city is located in northeastern Oklahoma on both banks of the Arkansas River. Tulsa occupies an area of…
Portland is a city in northwestern Oregon (USA). The Willamette River flows to its north through the central regions, dividing the city into western and eastern parts. Around it are located more than 30 dormant volcanoes. Portland is the place…
Pittsburgh is a large city located in the state of Pennsylvania in the northeastern United States. The Allegheny River, flowing from the northeast, and the Monongahela River, flowing from the southeast, meet in the rolling area of the Allegheny Plateau…
