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Ytre Oslofjord (Norwegian literally "Outer Oslo Fjord") is that part of Oslofjord which is south of the threshold of Drøbaksund (literally Drøbak sound), the strait where the fjord narrows between Drøbak and Hurum. Ytre Oslofjord stretches down to Færder Lighthouse (Færder Fyr) in the municipality of Tjøme in Vestfold.
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