Sibir is a "kidney-shaped" continent located in the southern hemisphere of the planet Deneva. It is the location of the Sibiran Range. (Decipher RPG module: Worlds)

Sibir is also the location of the province of Mallarashtra. (ST - Destiny novel: Lost Souls; TNG novel: Losing the Peace)

The Decipher guide describes Sibir as "cold and almost completely uninhabited," indicating Mallarashtra may be its only settlement.

the planet Deneva
cities and settlements	Tellerton • Lacon City
landmarks and institutions	Summer Island Playhouse
geography	Sibir • Sibiran Range • Summer Islands
bodies of water	Aurelius Ocean • Bolsibir Sea • Iapetus Ocean • Terringen Ocean • Toran Sea