Conservationists say Catfield Fen and its neighbour Sutton Fen - in the heart of the Norfolk Broads - are drying out because of water abstraction by local farmers.
They are hoping the Environment Agency will not renew their licenses when they come up next week but local farmers say, without water, they could go out of business.
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The Princess Royal will visit the Norfolk Broads today.
Princess Anne will be taking part in the Heritage Day celebrations at Potter Heigham marking the 60th anniversary of the death of Broads boating holidays pioneer Herbert Woods.
She will also visit the How Hill Trust at Ludham, HMP Bure at Scottow, and the YMCA Norfolk site at Trowse, near Norwich.
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A coroner's heard how a man strangled his partner before drowning himself on a boating holiday on the Norfolk broads.
Her 13-year-old daughter was left alone with him on the cruiser for almost a week before he committed suicide. Divers recovered the bodies after a hire company raised the alert.
Detectives believe John Didier planned the killing before setting off on holiday from London.
Malcolm Robertson reports...
A coroner has recorded a verdict of unlawful killing in the inquest of a woman who died on the Norfolk Broads in September.Read the full story ›
Inquests will be held into the deaths of a couple whose bodies were discovered on the Norfolk Broads after a 13-year-old girl was found alone on a boat.
Police found Annette Creegan, 49, from Mitcham, south west London, and John Didier, 41, originally from the US, dead last September.
Divers launched a search of the River Bure after the girl was found alone on board the family's rental boat moored in an isolated inlet between Wroxham Broad and Salhouse Broad.
Norfolk Police said the circumstances suggested it was a "domestic incident".
A post-mortem examination found Ms Creegan died from strangulation while Mr Didier died from drowning.
Ms Creegan worked as a community nurse for the Trinity Hospice charity in Clapham Common, south west London, while Mr Didier had worked for the NHS.
Anglers on the Norfolk and Suffolk Broads are starting to test the water regularly to help prevent fish dying from salt poisoning.
In the past millions have died when seawater has surged up the rivers but the Environment Agnecy has now teamed up with a group of volunteers to try to prevent it happening on such a large scale.
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A coroner has warned of the dangers of drinking too much while close to the water.
His comments follow the death of a man who was responsible for the safety of tourists on the Broads. 38-year-old Graham Cook fell into icy water after a night's drinking. He was four times the legal drink drive limit.