[ianaphysicist]

A bit larger than the US state of Delaware.

(5800 sq km is 2239 sq mi. The land area of Delaware is 1949 sq mi per Wikipedia)

[coolspot]

But how big it is in football fields?

[pc86]

About a million.

            1 sq mi     =      2,787,400 sq ft
        2,239 sq mi     = 62,419,737,600 sq ft
            1 fb field  =         57,600 sq ft
    1,083,676 fb fields = 62,419,737,600 sq ft