How Does Visibility Work?

[redrum68]

What hexes are visible seems really random and strange. Here is an example that shows seemingly random patches of hexes visible from the selected hex:

[Carlos]

Looks OK to me, you can see the hexes located along the ridges of the elevations higher than your current hex (which is level 6). The reason you can't see past the hexes located to the west and south of the current hex is due to the height of the cities/towns in the adjacent hexes.