This study aims to examine the phenomenon of code-switching in interactions between tour guides and tourists in the natural tourism area of Mount Rinjani. The research is motivated by the fact that most tourists visiting Rinjani come from various countries, prompting local guides to frequently switch between Indonesian, English, and local languages. A qualitative approach was employed using a case study method. Data were collected through direct observation and in-depth interviews with ten trekking guides actively working in the Rinjani area. The findings reveal that code-switching is used as a communicative strategy to bridge language differences, foster social closeness, and enhance the comfort of information delivery. These results highlight the significance of bilingual competence in the tourism sector
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