The special area of conservation Montesinho/Nogueira (PTCON0002) is a key area for conserving biodiversity in the Iberian Peninsula. Covering an area of approximately 1081 km² in the northeast of Portugal mainland, the PTCON0002 is home to a wide range of biodiversity, including several endemic and endangered species, and priority habitats. Despite its ecological significance and importance for conservation, there is a lack of publicly available biodiversity data, which urges the need to create a comprehensive and up-to-date biodiversity dataset for the PTCON0002.

To bridge the knowledge gap on biodiversity in PTCON0002, we undertook a thorough data collection process, such as species occurrence records and conservation status information at regional (Portugal) and European levels, from multiple sources. We collected and compiled this information for PTCON0002 resulting in a total of 31 871 records with 1 312 documented species. In addition, we developed an easy-to-navigate web-based geographic information system (Web GIS). In this article, we present an in-depth report on the process of compiling and preparing data, as well as the development and design of our Web GIS to increase awareness and enhance understanding of the importance of preserving biodiversity in PTCON0002.