We introduce Coronal-Line Forest Active Galactic Nuclei ( CLiF AGN ) , AGN which have a rich spectrum of forbidden high-ionization lines ( FHILs , e.g .
[ FeVII ] , [ FeX ] and [ NeV ] ) , as well as relatively strong narrow ( \sim 300 km s ^ { -1 } ) H \alpha emission when compared to the other Balmer transition lines .
We find that the kinematics of the CLiF emitting region are similar to those of the forbidden low-ionization emission-line ( FLIL ) region .
We compare emission line strengths of both FHILs and FLILs to CLOUDY photoionization results and find that the CLiF emitting region has higher densities ( 10 ^ { 4.5 } < n _ { H } < 10 ^ { 7.5 } cm ^ { -3 } ) when compared to the FLIL emitting region ( 10 ^ { 3.0 } < n _ { H } < 10 ^ { 4.5 } cm ^ { -3 } ) .
We use the photoionization results to calculate the CLiF regions radial distances ( 0.04 < R _ { CLiF } < 32.5 pc ) and find that they are comparable to the dust grain sublimation distances ( 0.10 < R _ { SUB } < 4.3 pc ) .
As a result we suggest that the inner torus wall is the most likely location of the CLiF region , and the unusual strength of the FHILs is due to a specific viewing angle giving a maximal view of the far wall of the torus without the continuum being revealed .