Bontang Mangrove Park located in Kutai National Park, North Bontang District, Bontang City, serves as a prominent mangrove forest tourism destination. Despite its popularity, the park lacks an official website, relying solely on social media for information dissemination. This limitation restricts the park's ability to reach a broader audience and provide comprehensive details about its facilities, operational hours, and attractions. To address this issue, a dedicated website was developed to enhance the park's online presence and improve visitor accessibility to information. The website design and development followed the Rational Unified Process (RUP) methodology, an iterative and incremental approach to software development that ensures adaptability to changing functional requirements. Functionality testing was conducted using the Black-box method, while user satisfaction with the website's design and usability was assessed through a Likert-scale questionnaire distributed to 100 participants, indicating a positive reception with 74.03% of respondents rating the website favorably. This rating classifies the website as "Good" in terms of functionality and user experience, demonstrating its potential as a valuable tool for promoting mangrove ecotourism in Bontang Mangrove Park. The findings highlight the website's ability to improve accessibility, promote ecotourism, and engage visitors through digital means.