Its highest point in the highlands on the eastern side of the island is a 340 m (1,120 ft) eroded volcanic cone.

There is a woman shaped figure made by trees on the island and a barrier reef about 10 km (6 mi) offshore from the west coast.

A 2 km (1 mi) strait separates Simberi from Tatau Island to the south west.

[1] Mining was suspended in December 2009 after Allied Gold received a cease work order from the Mineral Resources Authority of Papua New Guinea because of local landholder issues.

[1] Seven gold deposits have been defined in mining lease 136 (ML 136), which covers the central and eastern portion of Simberi Island, and other prospects have been identified.

[6] In September 2010, Allied announced that it planned to increase its gold production to 100,000 troy ounces (110,000 oz; 3,100,000 g) per year.

[6] St Barbara Limited (Australia) acquired Allied in September 2012 and is the current owner of this mining operation.