The French government has said it would cull more than one million birds in the coming weeks to fight a surging outbreak of avian flu on poultry farms.

All ducks, chickens and turkeys must be culled in some 226 municipalities in France's southwestern Landes, Gers and Pyrenees Atlantiques departments, totalling up to 1.3 million birds.

"It will take us about three weeks to clear the whole area," the agriculture ministry said.

By wiping out the populations where the virus is spreading, officials hope to shorten the outbreak and prevent it from reaching other poultry-raising regions.

Over one million birds have already been killed in attempts to smother the avian flu outbreak that began in late November.

Farmers in the region, famous for its lucrative but controversial foie gras liver pate, are compensated for the culled animals.

The ministry plans to requisition abattoirs and pull in large numbers of workers, including vet school students, to speed up the process.

Several European countries are now battling a highly contagious flu strain, H5N1, just a year after a similar virus decimated flocks.

Four bird flu outbreaks have hit France and especially the southwest since 2015, with 3.5 million poultry killed last winter.

Measures like quarantines at times of potential contact with migrating wild birds, and reduced densities at duck farms, "were necessary, but haven't been enough," said Herve Dupouy, a duck farmer and a farmers' union leader in Landes.

"We're desperate, farmers' morale is poor. How can we look to the future beyond the situation we're experiencing, with dead animals on our farms?" he said.

Cases of bird flu were registered in Northern Ireland in December and earlier this month a number of birds in Dublin Zoo, Belfast Zoo and Fota Wildlife Park were moved indoors as mitigation measures.

Meanwhile, the Department of Agriculture, Food and the Marine announced today that the last remaining Highly Pathogenic Avian Influenza Surveillance zone will be removed on Saturday.

The zone was located in Co Monaghan with a small area of Northern Ireland also included.