4 Introduction Sustainable tourism People are curious travellers by their inherent nature. From the dawn of our species, we have walked, rode and sailed to new places. First, because of the necessity and curiosity, today mostly for enjoyment and recreation. However, our way of traveling and spending free time has changed. We have great negative impact on environment and local communities. Global warming, biodiversity loss, waste generation together with soil, water and air pollution are some of the negative environmental effects. In addition, many communities have to deal with health difficulties, inappropriate living situation and unfair working conditions. In 2019, the Travel & Tourism sector contributed 10.3% to global GDP and employed 333 million globally. In 2020, a 50% decline has been recorded due to pandemic mobility restrictions, however tourism activity is again on the rise in 2021 (WTTC, 2022). Global tourism accounts for about 8% of global greenhouse gas emissions. Largest contributors are transport, shopping and food. Most of the footprint is exerted by and in high-income countries (Lenzen et al., 2018). Prior to pandemic, 50% of the global international tourist arrived to Europe. Tourism in EU is based on 2.3 million SMEs businesses, employing approximately 12.3 million people. In 2018, the sector directly contributed 3.9% to EU GDP and accounted for 5.1% of the total labour force (EU, 2022). Since the tourism is inherent to our nature, we need to change our tourism habits according to sustainability principles. Although there is no universal definition, World Tourism Organization defines sustainable tourism as "tourism that takes full account of its current and future economic, social and environmental impacts, addressing the needs of visitors, the industry, the environment and host communities" (UNWTO, 2022). Environmental aspects relate to developing low-impact activities not damaging to natural ecosystems, social elements include ensuring permanent employment with safe working conditions and equitable pay and economic dimension covers profitability and efficient use of resources. All three pillars of sustainable tourism should be developed based on local resources while respecting local cultures. Integrated water resource management There are many forms of tourism, one of the most popular being water tourism, which is based on rivers, lakes, seas and other waterbodies. Considering the sustainability in water tourism, Integrated water resource management (IWRM) encompasses many useful principles and practices. The concept is defined as "process that promotes the coordinated development and management of water, land and related resources in order to maximize economic and social welfare in an equitable manner without compromising the sustainability of vital ecosystems" (UNEP, 2022). Some of the challenges facing water tourism are increasing water consumption, water pollution and accompanying floods and droughts. To face these challenges, IWRM offers useful principles like:
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