We present Far Infrared (FIR) observations of the surroundings of the
Herbig Ae/Be star LKH_alpha234 in NGC7129, obtained with the Long
Wavelength Spectrometer (LWS) on board of the Infrared Space Observatory (ISO).
[CII] 158um and [OI] 63um and 146um lines are detected
everywhere in the mapped region and their intensity ratios are consistent
with the model predictions for a photodissociation region.
The spatial distribution of the emission features indicates the presence
of a emission peak which does not coincide with LKH_alpha234, but is more
likely associated with a close Herbig star, namely BD+65 1637.
We also compare the result of the FIR observations with the morphology of the CO, CS and H_2 molecular emission and discuss the interaction between the photodissociation region and the molecular clouds.