The rainforests of Africa’s Congo Basin are the world’s second largest, and are increasingly one of the most threatened. Agriculture, mining, logging, and climate change are already chipping away and thinning out the forests’ edge and interior. The Congo Basin forests’ biggest threat, however, is unseen: a lack of good information. With poor infrastructure, government capacity challenges, and hard-to-detect patterns of change, the forests of the Congo Basin are among the most difficult in the world to monitor and manage.