As heroic rescues continue as Cyclone Debbie wreaks havoc in northern NSW and southern Queensland, a woman's body has been recovered on a property.

The woman was found about 20km south of Murwillumbah, police have confirmed.

Police said the woman disappeared in floodwaters from a rural property at Upper Burringbar, and her body was found by a family member about 8am today, according to news.com.au.

Several flood-affected northern NSW towns have now been declared natural disaster zones after hundreds of residents fled inundated homes and nearby rivers peaked.

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Several towns in the state's north have been affected by the deluge caused by the remnants of ex-tropical Cyclone Debbie - including Murwillumbah, Chinderah and Kyogle - with the Wilsons, Richmond and Tweed rivers peaking.