High Quality Content by WIKIPEDIA articles! Yan Yean is a locality in Melbourne, Victoria, Australia, 38 km north-east from Melbourne's central business district. Its Local Government Area is the City of Whittlesea and Shire of Nillumbik. Yan Yean is home to Yan Yean Reservoir. Melbourne's first reservoir, a 560 hectare lake with a capacity of 30,000 megalitres, it was first established in December 1853 and provides water to Melbourne's northern and central suburbs. A park around the reservoir, managed by Parks Victoria, offers picnic, barbecue and walking facilities. Originally Yan Yean occupied quite a large area and the first Yan Yean Post Office opened on 1 March 1859 and was replaced by Morang in 1861. The next Yan Yean Post Office opened in 1875 and was renamed Yan Yean South in 1892 (later Mernda). A Barber's Creek office (opened 1876) was renamed Yan Yean Railway Station in 1892, then Yan Yean in 1907 and closed in 1974.