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This research aims to analyze the need level and test the validity, practicality, and effectiveness of developing teaching materials based on Islamic cultural ethnomathematics using the math city map application on geometry material for junior high school in South Sulawesi, which applies the Four-D development model. The needs analysis in developing teaching materials in this research involves junior high school mathematics teachers in four districts (Gowa, Takalar, Jeneponto, and Bantaeng) around the Islamic cultural heritage of old mosques in South Sulawesi. Data were collected through questionnaires, learning outcome tests, interviews, and documentation and analyzed qualitatively and quantitatively. The analysis in this research focuses on the level of need, validity, practicality, and effectiveness of the developed teaching materials. The data sources for this research are documents, students, subject teachers, and experts/validators, and this research involves small group trials and field trials at UPT SMPN 2 Tarowang. The research results show that the developed teaching materials have a need level of 78%, with the validity level of the instruments used falling into the valid category. The practicality level based on teacher responses is 93%, and the effectiveness level is indicated by the increase in the average score from the pretest (76.3) to the post-test (89.1) with an N-Gain of 0.58, which is categorized as effective. The research results show that the Islamic ethnomathematics-based teaching materials assisted by the Math City Map application on geometry topics in junior high school are suitable for use because they effectively improve students' mathematics learning outcomes.