Context and objective The purpose of the work in WP 2 of the MAGIC project is to map, characterise and analyse projections for current and future marginal lands in Europe facing natural constraints and provide a spatially explicit classification that will serve as a basis for developing sustainable best-practice options for industrial crops in Europe. This report provides an overview of definitions of and approaches to identify and map marginal lands. It will particularly focus on presenting the current state-of-play regarding marginal land definition and mapping. This report will form the state-of-play overview on which basis the approach to mapping marginal lands in MAGIC is to be developed. This mapping approach is presented in Deliverable 2.6 of the MAGIC project (Elbersen et al., 2017).