Mount William National Park  Mount William is a national park in Tasmania (Australia), 234 km northeast of Hobart. Established in 1973 as an 8,640 hectares large national park, it has been expanded multiple times, reaching 13,806 ha in 1980 and 18,439 ha in 1999. The park provides protected habitat to eastern grey kangarooes, wombats, Bennetts wallabies, Tasmanian pademelons, echidnas, brush-tailed possums and Tasmanian devils.