The nearest higher neighbor is Mount Hannah to the WNW.

There are isolated small valleys and basins between the mountain peaks.

[3] Seigler Mountain is separated from Mount Hannah by Salminas Basin, a large mountain meadow with an unusual complex of wetlands that feeds Cole Creek.

[4] Flows of porphyritic lavas from Mount Hannah and Seigler Mountain cover about 7 square miles (18 km2).

[6] A delimitation survey published in 2020 found that Seigler Mountain was infested by Mediterranean oak borers (Xyleborus monographus), a type of non-native invasive beetle that mainly attacks oak species.