Tulsa is a city located in the northeastern part of Oklahoma on the Arkansas River. It is the second-largest city in the state and has a population of over 400, 000 people. Ozark is a city located in the northwest corner of Arkansas on the Arkansas River. It has a population of around 3, 500 people and is known for its scenic beauty. River is a city located in the central part of Arkansas on the Arkansas River. It has a population of around 2, 000 people and is known for its historic downtown area. Hot Springs is a city located in the southwestern part of Arkansas on the Ouachita River. It has a population of around 35, 000 people and is known for its hot springs and spa resorts.