Matoushan, located within the Gutingkeng Formation, was designated as a landfill site due to the low water permeability of its mudstone in 2015. However, the decision was opposed by locals, who formed the Anti-Matoushan Landfill Self-Help Association and staged protests. With the help of professionals, they monitored groundwater and provided scientific evidence during environmental impact assessment meetings. Their efforts effectively demonstrated the potential impacts of the proposed landfill on local water sources, ecosystems, and residents’ health, leading to the suspension of the project in 2018. In 2019, the association became the Kaohsiung City Matoushan Nature and Humanity Association and has since led long-term citizen science surveys aimed at raising environmental awareness and increasing knowledge about diverse ecosystems and relevant issues in Matoushan’s shallow mountain area. The surveys included habitat and ecosystem observations, monitoring of wildlife corridors, and roadkill checks along patrolling routes.