Tanja is a locality in the Bega Valley Shire of New South Wales, Australia. At the , Tanja had a population of 157.
Tanja Public School is situated on Barrabooka Road. The school had an enrolment of 17 in 2017. It dates from 1878, having originally begun in a room of the school teacher's own residence.
Tanja Post Office opened on 1 September 1878 and closed on 28 August 1980.
Heritage listings Tanja has a number of heritage-listed sites, including: Haighs Road (within Mimosa Rocks National Park): Penders Nelson Lake Road, Nelson Lagoon, Mimosa Rocks National Park: Baronda
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