One Big Sustainable Island

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

Here are the COVID-19 Maine State policies that we are in compliance with:

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.

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At 1BSI...

We focus on environmental stewardship.We focus on environmental stewardship, sustainable alternatives, and a culture of health and happiness for our community. Respect for Nature comes from having a sense of gratitude and caring for the gifts that surround us. A visit to 1BSI allows you not just to see Nature, but to participate in, explore, and create the simplicity of living in Nature.


Annabessacook Lake in Monmouth Maineon 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.