마인강 is a river located in Germany, flowing through the states of Hesse and Bavaria. It is approximately 524 kilometers long and is a tributary of the Rhine River. The river is known for its picturesque landscapes and is an important waterway for transportation and trade. The Main River passes through several major cities, including Frankfurt, which is a significant financial center in Europe. The river is also popular for recreational activities such as boating and cycling along its banks, attracting both locals and tourists to enjoy its scenic views.