At that time the ground building was multitudinous, has the bedroom palace, the winding corridor, and the inner and outer city walls and so on.

当时地面建筑众多，有寝殿、便殿、回廊、阙门及内外城等。

youdao

The Inner City covers an area of 2.99 square kilometres (1.15 square miles) and the outer walls surrounding the city east and west of the Euphrates enclose an area of 9.56 square kilometres (3.69 square miles).

UNESCO: OFFICE FOR IRAQ