"The walled fort now known as Bright Tower Keep, on the western shore at the mouth of the Selintan River, began as little more than a walled camp fifteen years ago to guard merchant routes..." - Slavers, by Sean K Reynolds & Chris Pramas.
The Bright Tower Keep lies in the Lands of Safeton along the Wild Coast in the world of Greyhawk and the Flanaess. With the clean and other versions of this map, this keep can be placed just about anywhere in any campaign.
Cartouche heraldry by Anna Meyer, used with permission. Visit her page here: https://www.annabmeyer.com/
You can find the high resolution, DM, Player and Clean versions of this map on this post which also contains other maps related to the Slavers adventure. https://www.patreon.com/posts/122447837