Lake on the north central plateau of Amhara, Ethiopia, 1,800 m/5,900 ft above sea level; area 3,600 sq km/1,390 sq mi. It is about 75 km/47 mi long and 70 km/43 mi wide. The Blue Nile, the source of which lies just above Lake Tana, leaves the lake via the Tisisat Falls, where it is harnessed for hydroelectric power.
The Union Jack marks Australia's historical links with Britain. The Southern Cross helped guide early European navigators to the continent. Effective date: 15 April 1954.