GPT答：

7i24.cn

Yian County has a total area of 3685km2, 205,000 hectares of arable land, eighteen towns, twenty-five villages and a total population of 481,000, of which 19% are non-agricultural. It is one of the important grain base counties in the country and is famous for its creation of the subtropical corn "double cover" high yield and high efficiency model and being named as "the hometown of Chinese swan" by the state.