This book tackles the question of how tourism development and suitable policies can be used to promote sustainable development in Low-Density Territories (LDTs). The respective chapters, written by prominent experts, identify the problems associated with LDTs; highlight the comparative advantages of these territories with regard to tourism; propose methodologies for assessing the impact of tourism; and present case studies on the application of sustainable policies in tourism. Given its scope, it will be especially interesting for academics and researchers investigating LDTs and sustainable tourism, and for policymakers interested in developing these territories. LDTs represent an economic challenge, especially because most of them are home to an increasingly ageing population unable to pursue economic development. In these territories, tourism is emerging as an excellent opportunity to promote innovative dynamics, to lure investment, and to attract new people. However, itis important to promote sustainable tourism, which preserves the environment and communities' quality of life. The Chapter "Tourism, immigrants and lifestyle entrepreneurship: The (In)coming of people as a key factor for sustainability of low-density territories - A case study in Portugal" is available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.