I got the map from the dremora pirate but i cant fond the treasure.

Didn't I just answer this? Or did you post it here to get more info?

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http://www.uesp.net/maps/srmap/srmap.shtml?centeron=Velehk+Sain%27s+Locker.

"located west-northwest of Winterhold, and north of Saarthal, on an island with a statue of Talos"