Bloodvenom Post post-Cataclysm.
Central Western Felwood
To find the ruins of the post, follow the Bloodvenom River west along the south side, starting from the main stone path that runs north and south through Felwood. You will notice a dark trail — simply follow it around the hillside to reach the ruins.
Bloodvenom Post was lost due to the slime experiments of Winna Hazzard. She managed to corrupt the former inhabitants and turned them into Bloodvenom Slimeslaves. Though quests lead into Bloodvenom Post - which now has new architecture - the Post remains unrecovered at the culmination of the quest line.