Originally Posted by DArtagnan 
Given the setting, I found it pretty natural with a limited variety of environments. I wouldn't say it was the placement of such things as much as it was the existence of them.
The placement makes a huge difference to me. It breaks the immersion if items, weapons, etc., are placed in a way that's too unrealistic, or just doesn't make sense.
As far as the setting goes, Risen takes place on a small volcanic island, so I found the limited variety of environments completely fitting.