Geography instruction often falls short in effectively fostering students' attitudes and skills. Consequently, a Deep Learning approach is needed to render the learning process more meaningful, reflective, and character-oriented. This study aimed to develop a Case Method-based Geography textbook on Natural Resources to support the Deep Learning approach in high schools within the Jember Regency. The study employed the Research and Development (R&D) method using the ADDIE model. The trial subjects were Grade XI students at SMA Negeri Ambulu, and the instruments used included expert validation sheets and student response questionnaires. The results indicate that the developed textbook met the criteria for validity and practicality. Student responses regarding the Case Method integrated into the textbook demonstrated excellent conceptual understanding, independence, and collaborative skills, with a rating of 93.1%. Thus, this work serves as a highly relevant reference for the development of Geography teaching materials at the high school level.
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