One Big Sustainable Island (1BSI) is a non-profit organization dedicated to inspiring the naturally curious to sustainably explore, engage, create, and enjoy. At 1BSI, we focus on environmental stewardship, sustainable alternatives, and a culture of health and happiness for our community. Respectful use of nature's resources comes from having a sense of gratitude and caring for the gifts that nature has provided us.

Located on Annabessacook Lake in Monmouth Maine, this sacred 14 acre island has been occupied for thousands of years and is the perfect backdrop to learn how to live in modern times without losing touch with the natural world that makes it all possible. 1BSI is a metaphor for the Human Island: Planet Earth.