Grade II listed Meldon Park, which has fishing rights, is surrounded by historic parkland which leads to the River Wansbeck.
The property is being marketed by Savills. Andrew Black, rural director, said: "This has to be one of Northumberland's finest country houses. We have received interest from far and wide, and while the estate is ideal for those with equestrian, livestock, fishing and conservation interests there may be development opportunities within the stable block for purchasers seeking an additional income stream. A particular feature is the Biomass boiler which significantly reduces the running costs of the house."