Gapuwiyak (called Lake Evella in English) is an Australian Aboriginal community located in north-eastern Arnhem Land, Northern Territory, 25 km south of the head of Buckingham Bay and about the same distance south-west of Arnhem Bay. It is adjacent to Lake Evella. The lake was seen by Harold Shepherdson from his aeroplane the Miles Hawk in 1935 and he named it Lake Evella after his wife Ella and Eva the wife of a fellow missionary Rev. T.T. Webb.
The population is about 1000 people.(Pop - Grants Com1,412 - ABS Cdata 885 - ERP 977). The community is serviced by a barge from Darwin once a week that comes up the Buckingham River.
Gapuwiyak means "brackish water". (Gapu water - Wiyak salty).
The community comprises a vibrant mix of Aboriginal people from many different families or clans. It produces a newsletter called Gapuwiyak Dhäwu.