Extended Abstract
Introduction
The aesthetic features of the landscape may be utterly absolute or completely relative and measurable, such as beauty and ugliness themselves, or merit or inadequacy. These include basic aesthetic features, such as elegance, softness, balance or fluidity. It is necessary to know what attitudes are there to analyze the concept of landscape aesthetic value, especially in urban green spaces, and how can this intertwining be used to optimize space? It is this deep concept of aesthetics that encompasses all the material and spiritual realms of manhumankind and brings about a city full of excitement and order, happiness and serenity, dreamdreams and silence for citizens. One of the most important ways to achieve this is to pay attention to the NWHSNatural World Heritage Sites (NWHS). The Natural World Heritage Sites (NWHS) are identified by the United Nations Educational, Scientific, and Cultural Organization (UNESCO); they. They refer to natural landscapes of outstanding significance and universal value, recognized by all mankind that isas rare and irreplaceable. To determine indicators for LAV evaluation, we reviewed the related literaturesliterature, including the ecosystem services evaluation, the landscape aesthetic quality attractiveness evaluation, both in general scenic parks and on a larger regionalregion. weWe also reviewed the relevant researchesresearch about landscape and environmental planning. for approaches reference forreferencing landscape aesthetics and features assessment. Finally, we reviewed the NWHS with environmental issues and the experience of observers to answer the question of whether the landscape aesthetics in urban green spaces of Tehran District 22 isare moving towardstoward sustainability or instability?

Keywords: Sustainability, Landscape Aesthetic Value (LAV), Green Spaces, Tehran