Southern end of Tianjara Plateau between Goulburn & Nowra a possible hazard

National Parks are urging bush walkers at the southern end of the Tianjarra Plateau between Goulburn and Nowra to call police if they find any unexploded bombs.

The calls come after a former chief of naval aviation alerted authorities fearing someone could be killed if safety warnings weren't dramatically improved.

Regional Manager Dianne Garood says there's concerned about the southern area and are working with Defence specialists to rectify the situation.

Now a part of the Morton National Park the site on the Braidwood Road was once a ' live fire ' exercise area used extensively for more than 40 years until the 1980's.

In the meantime Ms. Garood says there looking to erect further signage to advise people of the dangers.