The 'edges' of Bowland (E.g Pendle hill, Fair snape fell, Nicy Nook etc) are nice and accessible and fairly popular areas. The 'interior' (Eg. Ward's Stone, Wolfhole Crag,Whitendale fell etc ) on the other hand is much more remote and often rough and trackless (And YES; boggy) If it's solitude you're after you'll get it in spades here (make sure your navigation's up to snuff though, swathes of it are featureless; akin to Bleaklow / Kinder.
Not long back I parked up at the Jubillee tower and hiked up to Grit fell and Ward's stone and returned down toward Tarnbrook. I didn't see a soul all day. No-one. Not even in the distance on adjacent fells. Pretty eerie actually.
It's a beautiful place, but Make sure you're with someone or a least leave a plan behind; if you get into difficulties it may be a while before you're found; 3 weeks in the case of a fell runner a couple of years ago. And he wasn't in a particularly remote part of it.