<Dl> <Dd> New South Wales' western border is extended to 129 ° E . </Dd> <Dt> 3 December 1825 </Dt> <Dd> The colony of Van Diemen's Land is proclaimed . </Dd> </Dl> <Dd> New South Wales' western border is extended to 129 ° E . </Dd> <Dt> 3 December 1825 </Dt> <Dd> The colony of Van Diemen's Land is proclaimed . </Dd>

What appears to make most of the borders for the states in australia