Mountain regions are marked by unique economic traits that present both challenges and opportunities for sustainable diversification. Geographic isolation, limited infrastructure, and environmental vulnerabilities constrain development and create dependence on a narrow range of industries, particularly agriculture and tourism. This makes these regions especially vulnerable to economic volatility and environmental degradation. The hereby study explores the economic characteristics of mountain areas and proposes strategies for sustainable diversification to enhance financial resilience and reduce sectoral dependency. A mixed-methods approach combined quantitative analysis of industry composition, employment, income, and environmental indicators with qualitative case studies. These methods identified economic vulnerabilities and successful diversification strategies in various mountain regions. Regions with better market access and infrastructure successfully integrated higher-value activities such as agro-processing and niche tourism. The sustainable diversification of mountainous regions requires an integrated approach that harmonizes economic, social, and environmental objectives. By prioritizing context-specific strategies, fostering local engagement, promoting cross-regional collaboration, and embedding sustainability into all aspects of development, these regions can unlock their full potential. In doing so, not only will they contribute to national and regional economic growth, but they will also preserve their unique natural and cultural heritage for future generations. Tailored strategies are necessary to address the specific economic, social, and environmental contexts of mountain regions. Recommendations also include fostering public-private partnerships, infrastructure investment, improving education and vocational training, as well as promoting innovation in sustainable sectors
