To the north, the mountains slope down to the Pacific Ocean, and to the south lies the basin of the Sepik River.

The mountains are named after the Italian physicist and mathematician Evangelista Torricelli during the German colonial period.

[1] The portion of the range above 1000 meters elevation is home to the Northern New Guinea mountain rain forests ecoregion, which also extends across portions of the neighboring ranges.

The slopes below 1000 meters are part of the Northern New Guinea lowland rain and freshwater swamp forests.

[3] Discovered in 1981, the critically endangered northern glider (Petaurus abidi) occurs exclusively in an area of less than 100 km2 in the Torricelli Mountains.