There is actually a little 'cul-de-sac' at coords 74.95...take your boat from the speedbarge there and there's an uphill path that takes you right into Tanaris.
Quest
Tanaris is Calling
A World of Warcraft quest in Tanaris. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Orrrrrrrrr.....you can sail south of Speedbarge.
reference: threadmeters . com/v-1but/How_do_you_get_to_Tanaris_now_horde [new comers can't share links unfortunately hence the spacing between the period above]
"Well the whole point is that you can easily get to Tanaris if you level in Kalimdor. The quest line sends you to the Speedbarge where you have quests to give you a river boat. Short of that you can swim which would take a couple minutes of your life and you just swim to where the old path from Shimmering Flats went into Tanaris. It's not like the zones completely were shifted and mangled, Thousand Needles is exactly like it was when you left it, just now under a couple hundred feet of water. " ~Cloaknpoke
The text in bold is pertinent ;] Especially if you do not use coordinates [I prefer my map, to each their own].
No troubles if you cannot fly. Look for the small bump in the middle of the curve at the bottom of your map - that is the beginning of the path through the hills. There is also a road still on the lake bottom that runs north to south on the west side of the barge. Just follow that south and you will be in Tanaris in no time.
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(27447))
Requirements
Read from the Blizzard quest API.
Description
Heya, {name}, Megs Dreadshredder down in Tanaris left a message for you. She says that the goblins down there in Gadgetzan heard about what you've been doing up here. Anyway, the Cataclysm hit them hard, too. Not as hard as us, but I'm certain they could use your help. Besides, that Megs is a hottie!
Community notes from Wowhead · 8 comments
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Reward details
Reputation: Bilgewater Cartel +10
Run by the ruthless Trade Prince Gallywix, the Bilgewater Cartel is the most powerful trading company on the Isle of Kezan. From their headquarters at Bilgewater Port, the cartel dominates trade all over the South Seas.
Reputation group: Horde.
Other quests in Tanaris that reward Bilgewater Cartel reputation: Seaside Salvage (+250), Rocket Rescue (+250), To The Ground! (+250), Booty Duty (+250), Un-Chartered (+250), Get The Centipaarty Started (+250).
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.
Where this quest fits
Other quests with this name
This one: Horde only · Tanaris · Level 15-30.
Steps, storylines and map placement from the client’s QuestLine, prerequisite and QuestPOI data; neighbouring quest text is Blizzard’s own (quest API), shortened to its opening sentences.