In reply to Wainers44:
> Just your side of Dartmoor, I would suggest start Sourton (A30), Sourton Tor, West Okement Valley, Black Tor, Foresland Ledge, Sandy Ford, Kitty Tor, Bleak House, Great Links Tor, Nodden Gate, Brat Tor, Chat Tor and then stagger back down the path then track/old railway to Sourton. Huge ascent in not too many miles!! Best of luck!
Good old memory map shows that neatly as exactly 20K and 1000m of ascent. I have run most if not all of that route and the ground is pretty good by Dartmoor standards! Only soggy bits are around Chat and briefly after Kitty (although there is a path, you just need to search around a bit!)