Description: Cooperation between the EEA and the six Eastern Partnership countries (Armenia, Azerbaijan, Belarus, Georgia, Republic of Moldova and Ukraine) was implemented through the EU-funded regional project “Implementation of the Shared Environmental Information System principles and practices in the Eastern Partnership countries” (the ENI SEIS II East Project). The period of implementation of the ENI SEIS II East project was 48 months, 1 February 2016 - 31 January 2020 (extended until 30 June 2020). The ENI SEIS II East project built on the regional EU-funded project ‘Towards a Shared Environmental Information System (SEIS) in the European Neighbourhood (ENPI-SEIS executed in the period December 2009 - March 2015), also implemented by the European Environment Agency (EEA). The project supported the environmental and statistical authorities in the six Eastern Partnership countries in gradually developing and extending their national environmental information systems in line with the SEIS principles in terms of institutional cooperation, content and infrastructure. The second phase of SEIS cooperation through the ENI SEIS II East project( https://eni-seis.eionet.europa.eu/east) aimed to help the countries find solutions to better respond to regional/ international commitments related to environmental reporting; to improve their capacities to manage and use environmental statistics, data and information in support to decision-making; and prepare regular State of the Environment Reports (SoER) and indicator-based assessments. At national level, the project was coordinated by two National Focal Points (NFP), representing the Ministry of Environment and the National Bureau of Statistics. Activity 2.3 of the ENI SEIS II East Description of Action (https://eni-seis.eionet.europa.eu/east/governance/project-documents) “Pilots on extending CORINE Land Cover (CLC) methodology to areas of the partner countries” was a step to facilitate the access to, and use of, some spatial data required for SEIS implementation at national level. This activity also allowed direct links to related initiatives and programmes at the European level; namely the just completed work to produce the 2018 update of the CLC layers in the EEA39 countries, and services provided through the Copernicus Programme. The European Topic Centre on Urban, Land and Soil Systems (ETC/ULS) assisted the EEA for the implementation of Activity 2.3 of the ENI SEIS II East. Experts from the ETC/ULS have conducted feasibility missions to propose technical partner institutions in each partner countries, provided training courses and quality control for each of the CLC pilot projects. The ENI CLC pilot project implemented according to the methodology and rules of the European CLC project: Computer assisted photointerpretation of satellite imagery, standard European level-3 nomenclature, 25 ha minimum mapping unit (MMU) for status layer, 5 ha MMU for change layer, minimum width of linear elements is 100 meters. The pilot included mapping the recent status layer (CLC2018), a CLC Change layer between the 2000s’ and 2018 and the back-dated status layer for the 2000s’. Sentinel-2 imagery was available for 2018, and Landsat TM/ETM data for the 2000s’. Additional information about CLC product description including mapping guides can be found at https://land.copernicus.eu/user-corner/technical-library/clc2018technicalguidelines_final.pdf. CLC class descriptions can be found at https://land.copernicus.eu/user-corner/technical-library/corine-land-cover-nomenclature-guidelines/html/.