We use U (in) with:

  1. City, country, village, etc.
  2. Everything that is inside of something

We use NA (on, at) with:

  1. Waters (river, lake, sea, ocean, island, etc.)
  2. Aerodrom, fakultet, univerzitet, stadion
  3. With everything that is high, e.g. mountains, hills
  4. Directions, seasons….

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