I'm with DarkArts on this one. I've been to the "B" isles at least a half-dozen times each to dig, but I think I'm misunderstanding where the center is.
We know that it's different for each player, but if you've already successfully done this quest, can you give us a hint? How did you find the center of the isle? Dead reckoning? Did you measure from tip to tip and then dig in the middle of that?
Am I missing an isle?[Meadow (Birch/Brown/Big Forest); Glacier (Barren/Blizzard); Narrowton (Bend Isle); Angled (None); Plains (None); Marshy (Bog); Deadwood (Bones); Dry (None); Leaf (Bulb--Bud is not included in search); Jungle (Banana); Mountain (None included in search)]