Annabessacook Lake, Maine

Private island glamping with a downeast grin.

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.

Today on the island

Lake temp: 25*F

Fire risk: MED

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.

A non-profit community inspiring the naturally curious to explore, create, and enjoy island life.
Resetting Humans one Island at a Time!

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At 1BSI...

Sustainable, off-grid vacation adventures. Simple living is good living.

Rustic does not mean roughing it.

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.

Island Adventure

Island Life Made Easy

We focus on environmental stewardship. Pack your favorite foods and vacation clothes for the island! We'll take it from there.

Nature made this island remote, we made it convenient

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.

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Island lore, quiet openings, and a little mischief - in short bursts, when it matters.

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Island Questions We Hear a Lot

What makes 1BSI different from other glamping sites?

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.

Do I need a boat to stay on the island?

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.

What should I expect from an island stay?

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.

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