Thanks for this post, I almost went to the alliance areas for this, didn't make much sense to me.

Cartographer co-ordinates in Sludge Fen: 56.7,8.3 (or simply 57,8) In a chest.

Cartographer co-ordinates in Silverpine: 39.2,38.1 (or simply 39,38) I am standing on the fissure as I write this.