STELLA is evaluating the economic and environmental benefits and implications deriving from the Eastern Partnership (EaP) countries' convergence with the EU environmental acquis. The six EaP countries are: Armenia, Georgia, Azerbaijan, Belarus, Moldova and Ukraine. This is an unusual study: typically, benefit studies estimate the benefits for a country or a region of improving the environment situation in that same country or region. In this study, the goal is to estimate the benefits that the EU would derive from environmental improvements in the six neighbouring EaP countries. The potential environmental and health benefits - as well as the potential social and economic benefits for the EU - are quantified using a set of indicators in the following areas: water resources; marine areas; air quality; biodiversity resources; waste management; and economy and enterprises.