The lone Australian tramper believed to have fallen to his death while walking in Fiordland National Park has been named.

He was James Poland, 48, from West Launceston, Tasmania, Te Anau police said today.

His body was found by a search and rescue helicopter crew in the mountainous Lake Adelaide area yesterday afternoon.

Sergeant Brock Davis, of Invercargill police, said it appeared Mr Poland died after a fall at Barrier Knob, about 3km north of Homer Hut.

Mr Poland set off on a lone three-day tramp over Gertrude Saddle on Thursday, planning to emerge at lower Hollyford Rd yesterday.

He was holidaying in New Zealand with his wife and children and his wife raised the alarm when he failed to return yesterday.

It was likely he had fallen on the first day of his tramp, Mr Davis said.