Scores of smaller rivers drain into the Wei River near X’ian, making the area one of the country’s most productive agricultural regions for centuries. As a result four  ancient Chinese kingdoms made their capital near X’ian on the Wei River:
Zhou Dynasty   (1046 – 256 BCE )     [Ancient Greece ]
Qin dynasty           (221–207 BCE )      [Ancient Greece ]
Han Dynasty     (206 BCE–220 CE)      [Roman Empire ]
Tang  Dynasty            ( 618–907 CE)   [Early Middle Ages]

The Shaanxi History Museum in X’ian ends with the Tang dynasty

The Terra Cotta Army is one of X’ian’s most spectacular sites dating from 221-209 BCE

Maps in China likely pre-date this one rescued from a tomb, but historical treasures above ground were destroyed by the Cultural Revolution.

The map below shows the route of the Yellow River (top) and the Wei River (bottom) .