Translation guide
The country name 'Switzerland' is typically expressed in Japanese as スイス (Suisu). This is the standard and most common way to refer to the country in all contexts.
Referring to the country of Switzerland
The standard Japanese name for Switzerland, used in all contexts.
スイスは美しい国です。
Switzerland is a beautiful country.
来年スイスに行く予定です。
I plan to go to Switzerland next year.
Formal name: Swiss Confederation. Used in official or diplomatic contexts.
スイス連邦は永世中立国です。
The Swiss Confederation is a permanently neutral state.