Welcome to the forums, Crinos.
As for your question...
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You have a number of instances.
1) The assassin sent by Rannos and Gremag. If you sell a piece of Lareth's equipment (preferably his boots), you'll eventually get an encounter with this killer on the world map. Once you kill him in combat, a map to the temple is on his corpse. This is one you can get post-moathouse, but is advised for a Level- 4 or -5 party.
2) The Waterside Hostel in Nulb. You can get the location from either Rentsch (sp?), Watt, or the lady in the far right corner. For getting the map from the lady in the far corner, you must go through the "Spy who loved me" quest.
Note: It's most-advised to gain map access from Rentsch or Watt is if your party is of evil alignment. Though a won't fall by gaining access through either of these 2 NPCs, you might regret it later.
3) Mother Screng in Nulb. You'll have a dialogue option w/ her to get the location.
That's all I can think of at this time. Enjoy.
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