That's alarge even by US standards. The largest plantation in Georgia was 33,000 acres untilthe owner died and through his will gave away 1,000 acres (the former CEO of Coca Cola). Of course there are larger private holdings in the western US, but most of those holdings are in lightly populated areas whereit's dry and there islittle commercial appeal.
In the fragmented UK, I'm surprised there are still tracts that size.