Velehk Sain's Treasure

Velehk Sain is a daedra being you can find in The Midden in an unmarked quest.

If you do choose to release him, then he will give you a map to his treasure. (The treasure will not appear if you haven't met him or if you choose to slay him instead of freeing him).

If you kill Velehk and quickly loot his corpse before it disappears he gives two scimitars and vestments from Hammerfell.

Another method for obtaining the map and killing him is to release him, then cancel the conversation while he is still talking and quickly attack and kill him before he's finished speaking. A paralysis weapon works well to immobilize him. The map will have been transferred during the chat, and the body is still lootable.

Well it's not the most indirect treasure map you have ever seen. In fact, the map is more than just upside-down and there is no note in it. Most will have trouble looking for it so here is the pinpoint on the world map.

Note: You Need the map in your inventory for the treasure to appear. (Not confirmed, I took the map and killed him, and deposited the map at my house. I say it should be the inventory because it says above that you can kill him after taking the map.)

Location of the Treasure : The map is very misleading, get down to the water level and head directly west from College of Winterhold until you come across a rather flat peninsula that appears to have a path going up it. Go off to either side all the way around the peninsula until you can see the large statue of Talos and below that on the ground should be the treasure. The peninsula is just south and a little west of Ysgramor's Tomb.