The Douro River is a

The Douro River is a major river on the Iberian Peninsula, running through Porto, Portugal and out to sea. "Louis I Bridge" is the most famous bridge across the Douluo River. It is said to be designed by Gustave Eiffel, the designer of the Eiffel Tower in Paris (the style is quite similar). The bridge can be divided into upper and lower parts, with traffic on the upper part. The subway and the lower part are cars. Whether it is day or night, the scenery of this bridge is very charming.