Central Carneddau ridge in Northern Snowdonia, you have height and an almost featureless terrain.
Its an area i know well, and is a magnificent area to test ones navigation skills, or lack of them.
Another benefit of the area, is that there are numerous parking areas, at every point of the compass, making it very accessible and in an emergency help is not that far away.
The Carneddau's main ridge tops the 3000ft contour for almost seven miles, and its the highest continuous land above 3000ft outside Scotland.
Its Northern sections are virtually all on easy grass, but navigation especially from Bera Mawr towards Foel Grach is incredibly challenging in bad conditions, as there are very few objects to take a bearing from.
Mid Wales, especially the Plymlimon region, is also a real challenge, but parking is limited.
Ive crossed the Carneddau in some really bad weather, and the exposure is incredible, but i tend to give them a wide birth when the mist is down
Due to its close proximity to the Irish Sea, it attracts some of the thickest mists anywhere in Snowdonia, but safesty is never far away, which is an important thing to take into account.