Football-fields meaning

She was able to breathe easier when she stood outside the massive fortress that sat on a clearing the size of two football fields.

It towered twenty stories tall and sat in a clearing the size of two football fields.

There is a public park, besides bowling-greens and cricket and football fields.

Carnival Triumph offers a huge vacation playground that measures more than three football fields long.

The Carnival Cruise's Triumph is a gigantic vacation playground, which boasts an impressive outdoor entertainment area that measures more than three football fields long.