When answering the question "Wo": In can be followed by the name of a city, town, state or country. When the name of the country is feminine or used in the plural, the noun phrase is in the dative case (in der Schweiz, in der Türkei, in den Vereinigten Staaten). In is also followed by dative case forms with all specific locations such as areas, buildings and rooms. (im = contraction of in + dem) An (at) is followed by dative case forms when indicating location and most often applies with bodies of water. (am = contraction of an + dem).
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