Kilsfjord is a continuation of Kragerøfjorden. Kilsfjord extends west from Tåtøy, an island in the archipelago just south of Kragerø. The area goes in a westerly direction and broadens further in. It then turns to the north and narrows sharply again, before ending at the village of Kil at the head of the fjord. 
The Kragerø River (Kragerøvassdraget) flows into the north eastern side of the fjord, about three miles west of Kragerøfjorden . Highway 351 follows the south side of the fjord.
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