Where is the quil of gemination located in lake honrich in skyrim?

In The Elder Scrolls V: Skyrim, the Quill of Gemination is at the bottom of a lake outside Riften. It is inside Vald's Strongbox, which is near a partly sunken rowboat between a large boat at the Fishery and a boat at Goldenglow Estate. The Quill, owned by Maven Black-briar, can replicate any writing using a special kind of ink.

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