Treated by several specialists, sustainable regional economic growth is analysed primarily from the concept of “sustainable regional economic development”. The aspect can be approached in relation to the following basic elements: environment, society and economy. These three important components outline a system determining and measuring the sustainable economic development image and the reciprocal actions between them.
The process of economic growth can be considered sustainable in economic, social and environmental terms, based on preventing and shutting down the actions of depletion of natural resources and environmental degradation.
Environmental protection and economic growth were seen diverging by Meadows et al. (1972) , which show the boundaries imposed by the limited character of the natural resources reserves on the economic growth and the impact of the latter on the environment . Step by step, we reach certain reconciliation. On this background, despite all significant differences existing between sustainability and sustainable development, these two terms come to be used as synonyms in this attempt at reconciliation.
In order to maintain the ecosystem resilience, a criterion was shaped, limiting the economic activity volume, the consumption and the population, contributing to the advancing of opportunities for regeneration of global ecosystem .
The context presented enables an analysis of the sustainable development of tourism through regional development, based on the clarification of concepts such as region, regional development.
Regions are presented as a space of running overlapping processes, presented by R. Balme  as representing features of contemporary governance. Functional and institutional linkages are highlighted through the significant role of the regions. The region acts as first intermediary pawn between territorial and functional, then between local and national, but also as integrator of government policies.
Erdeli G  presents the region as territorial delimitation to guide the regional policy of the government towards reducing territorial imbalances identified between most developed and least developed areas and the best framework for implementing and assessing the regional development policy.
A significant component in defining a region is considered by Thise J.F. as the similarity that says that “places forming the region are, in one way or another, considered similar enough to be grouped together within the same spatial entity” .This author presents the similarity by interlocking two sides:
– on the one hand, according to the principle of homogeneity – This concept has been used by geographers in the nineteenth century, through the similarity between places;
– on the other hand, according to the functional principle – the interlocking of two concepts, thus addressed by geographers and economists, context in which similarity is regarded by certain relationships between different places forming the region (idem).
In time, a weak correlation was noticed between borders of regions approached in terms of results based on statistical information and limits set with respect to their political and administrative boundaries. In this context, because of these inconsistencies, situations often appeared where specialists in forecasting draft regional development strategies that are not consistent with regional issues .
However, although definitions and boundaries aimed at functional economic criteria with precision and enhanced utility are approached, the processes of facing the impossibility of gathering comparable data and the dynamic limits position, which may change over time, represent impediments towards their applicability.
As regards the regional development, Polese M  presents it as a capacity of regions to produce (and sell) goods and services, and therefore a capacity to earn income by the population. Regional development disparities refer to differences between regions in their ability to provide opportunities to earn income for their residents.
This type of development requires shaping a functionalist reason of organizing economic life and are focuses towards a “territorial” reason: “development will be able to meet the real needs of the population locally and by means of local values and resources and the participation of local people” . This phrase increasingly used in recent decades, “regional development”, is also approached by the United Nations to appoint efforts to better organize the space of populations and human activities . Its goal is to improve the living conditions of the entire population, to implement a multi-dimensional reason as regards the development and to adopt the region as a basic unit to organize such activities .
The evolution of regional patterns is experiencing the phenomenon of disparity in development levels among regions, being more acute in the early or intermediate stage of economic development of a country. As mentioned by Parr J.B. 1999 , this happens because the economic activity is not dispersed, but only at certain points and regions that enjoy competitive advantages: resources, access to markets, proximity to political and administrative centres, etc. A sustained economic growth of the country will lead to a maximum level of disparity between regions, where these disparities fall.
The interdependence of sustainability with regional development is seen very well at the level of tourism. This area is well suited to sustainable regional development, given that the practice of tourism activities is performed under environmental protection and rational use of resources. However, the development of regional tourism activities by constituents leads to a rational and responsible resource and results management based on environmental conservation and protection, representing a lever for economic recovery.