Dendroglyphs officially opened on Saturday. It contains four trees that have been carved with the distinct markings of the Wiradjuri and Gamilaroi tribes.

WPCC manager Andrew Glassop said there was nowhere else in Australia where you could see such a collection of dendroglyphs.

"It's very rare to see these objects and to see four of them at once is quite extraordinary," he said.

There are two main reasons the trees were carved: to use as burial markers and for ceremonies. Mr Glassop said it Dubbo, they were predominately used for the graves of tribal leaders.

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"Unfortunately, they do what trees do. If they're not re-carved then the tree will heal naturally and cover it up, or there'll be a bush fire or flood or white ants," he said.

While there would have been thousands of trees carved, now there are only expected to be about 100 left.

The designs are largely geometrical as well as containing images of animals like goannas, but Mr Glassop said their meanings are unknown.

Three of the trees came from a nearby property - and were originally donated to the Dubbo Historical Society - while the fourth was found floating down the Macquarie River after a flood.

Months of collaboration was undertaken with the Dubbo Aboriginal Working Party before the trees were exhibited.

"They said 'we need our young people to see our culture and we need the people who come here to see our culture'," Mr Glassop said.

The exhibition will be on display until June 23.