|Location||New Siberian Islands|
|Adjacent bodies of water|
|Area||5,300 km2 (2,000 sq mi)|
|Length||85 km (52.8 mi)|
|Width||60 km (37 mi)|
|Highest elevation||65 m (213 ft)|
|Federal subject||Sakha Republic|
It was formerly recognized as an island, but it is geographically part of Kotelny Island. The peninsula projects from the northern end of Bunge Land eastwards with its isthmus in the north. There is a deep inlet on Faddeyevski between its western coast and adjoining Bunge Land.
Faddeyevsky is covered with tundra vegetation and dotted with small lakes.
Unlike neighboring Kotelny this peninsula is relatively flat despite its size, its highest point being only 65 m. Its area is 5,300 km².