One Big Sustainable Island

A non-profit community dedicated to inspiring the naturally curious to explore, create, and enjoy our vacation island.

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1BSI offers...

Sustainable, off grid vacation adventures. Sustainable, off grid vacation adventures, eco-tours of the island and lake, half-day, full-day, overnight and weekend retreats, events and workshops. Vacation rental packages are now available for exclusive overnight stays in five different locations.

At 1BSI...

We focus on environmental stewardship.We focus on environmental stewardship and a culture of health and happiness for our community with sustainable alternatives. Respect for Nature comes from having a sense of gratitude and caring for the gifts that surround us. A visit to 1BSI allows you to participate in, explore and enjoy the simplicity of living in Nature.


Annabessacook Lake in Monmouth Maine on Annabessacook Lake in Monmouth Maine, this sacred 14 acre island has been occupied for thousands of years, and is the perfect backdrop for learning how to live in modern times while remaining in touch with the natural world that makes it all possible.


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