Unplug in a place where loons call the schedule. Canoes, campfires, and a little Maine magic await on 1 Big Sustainable Island on Annabessacook Lake in Monmouth, Maine — near Winthrop.
Lake temp: 68*F
If the loons are louder than your phone, you're doing it right.
Quick Answer: 1 Big Sustainable Island is a private, off-grid island retreat on Annabessacook Lake with cabins, glamping tents, and quiet, nature-first stays.
Simple living is good living.
Take a break from the busy world and find yourself in nature, exploring island life on a Maine lake.
The island has 7 Maine Glamping Sites! These are unique lakefront stays on the way to Acadia National Park.
Island life brings a touch of luxury to off-grid glamping in Maine.
Pack your favorite foods and vacation clothes for the island! We'll take it from there.
We make private island glamping seamless and fun. Getting to and from the island is part of the adventure with our canoes and kayaks, regular ferry service, and docks for your own boat. Island living is a breeze in our fully equipped glamping sites.
Me and my wife loved everything about our stay to our private little dome. It was quiet, peacefull, and more importantly it was quiet. Kent was an awesome host from when we pulled in to the last ferry ride home. All in all it was a great way to spend our wedding anniversary together
The Oaktagon was a peaceful, unique stay. The logistics of getting to the island and moving gear were stress-free and felt like a natural part of the experience. We highly recommend!
Amazing stay! Would do it again! A frame was so cozy, a little chilly in the morning but everything you could need was on the island. Great host as well :)
From guest reviews collected by Revyoos. Read all our reviews.
1BSI is a non-profit, private island retreat on Annabessacook Lake focused on nature, sustainability, and simple living. We balance comfort with off-grid adventure - think hammocks, lake paddles, and firelight, not commercial resort vibes.
Nope! You can arrive by canoe or kayak (gear provided), catch our seasonal ferry, bring your own boat, or even paddle yourself for a quiet crossing.
Expect slower days, quiet nights, and real nature - loons, stars, lake mist, and the type of calm your phone can't interrupt. We provide the essentials; you bring curiosity and your favorite food.
Bookings go fast in peak season. We'll help you pick the right spot.
