GuyMIS is a web application dedicated to monitoring the extent and the change of mangroves in Guyana. Mangroves serve as a link between terrestrial and marine environments and as such, perform multiple functions including coastal protection, livelihoods for coastal communities, carbon sequestration and other countless ecosystem services. . The loss of mangroves has generated diverse negative climatic, social, ecological, and environmental impacts, thereby promoting the need for strategic plans for management, protection, and restoration actions. Guyana has taken progressive steps to manage its mangrove forests by implementing several strategies with National Agricultural Research and Extension Institute (NAREI) leading the drive to sustainably manage, restore and monitor the country’s mangrove resources since 2010. This web application is a critical component of NAREI’s mangrove monitoring system, which integrated GIS, remote sensing, field surveys and community engagement and research to better monitor and assess Guyana’s mangroves. The objective of the App is to make mangrove-related data freely available to partner organizations, government, and civil society on mangrove-related land-use change data that will allow for improved and efficient decision-making and actions related to hotspots of deforestation; engagement in land-use planning, policy-making, and actions that protect mangroves; planning for protection of farmers in low-lying coastal area; and efforts to support forest and biodiversity conservation in Guyana. A publication detailing the methodology used for this tool is in preparation.