Switzerland was a country on the European continent of Earth. Switzerland's flag was red with a white cross. (ENT: "First Flight")
When Data had traveled back to 1893 and claimed to be a Frenchman, Samuel Clemens wrongly remembered him to be from Switzerland. (TNG: "Time's Arrow, Part II")
As Clemens did not believe Data, it is possible he intentionally misremembered to test Data's backstory.
In the late 20th century, Switzerland was a founding member of the European Space Agency. (ENT: "First Flight")
Tom Paris suggested to B'Elanna Torres to go skiing in St. Moritz, Switzerland. (VOY: "Waking Moments")
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