Graveyards are Inherent Terrain. However, if I'm firing across an ADJACENT Wall hexside that is also part of a graveyard (i.e. lengthwise) at a target 4 hexes away (e.g. 53P2 --> L2), do I have to count the Graveyard as a Hindrance?
The graveyard hinders the entire hex plus hexsides - except for any walls and hedge hexsides (last sentence B18.1):
B18.1 A graveyard represents a West European style cemetery with densely concentrated stone gravemarkers and mausoleums. Any hex containing gray/white rectangular shapes — such as 12W4 or 21L5 — is considered a graveyard hex. It is not the graveyard symbols, but rather the entire graveyard hex (inclusive of non-wall/hedge hexsides) which affects any LOS drawn into or through it.