1 Big Sustainable Island

Floating Island Cabin

A unique nature stay for outdoor retreats on Annabessacook Lake in Monmouth, Maine — near Winthrop.

Quick Answer: Floating Island Cabin is The Nautilus is a floating love letter to reinvention — a cabin, a tiny home, and a houseboat all rolled into one quietly wonderful idea. Moored beside 1 Big Sustainable Island, it lets you wake to gentle waves at your door, watch the sunrise from bed, and step straight onto a floating porch for morning coffee. It’s proof that with a little imagination (and a lot of care), something old can become something entirely new on Annabessacook Lake in Monmouth, Maine.

The Nautilus is a floating love letter to reinvention — a cabin, a tiny home, and a houseboat all rolled into one quietly wonderful idea. Moored beside 1 Big Sustainable Island, it lets you wake to gentle waves at your door, watch the sunrise from bed, and step straight onto a floating porch for morning coffee. It’s proof that with a little imagination (and a lot of care), something old can become something entirely new.

Guest Reviews from Revyoos — Showing 10 of 128 Reviews · Average 4.98 / 5

Ann October 16 2025
Rating: 5.0 / 5

Pristine location, great hosts!

Margaret October 13 2025
Rating: 5.0 / 5

We had a truly magical experience on 1BSI. Kent, Heather and team were incredibly communicative and helpful every step of the way. We felt so welcomed and our pup had the absolute time of her life canoeing, swimming, and zooming around the island. My partner also had amazing luck catching a couple serious largemouth bass. Really nothing beats waking up directly on the water like we did at the nautilus house. 5 stars really doesn’t do it justice. We’re already talking about our next trip to the island!

Melissa October 10 2025
Rating: 5.0 / 5

My husband and I were looking for a place last minute to spend a few nights on our honeymoon,that would allow us to bring our dog and boy did we hit the jackpot. Everything was perfect. Kent was a most gracious host. The Nautilus was the perfect cabin to begin our journey on the island in. We had everything we could have needed and more to stay for two nights. We wiahed we could have stayed longer. We will definitely back to visit the island. Thank you for everything Kent, you made our stay quite pleasant.

Nicole October 05 2025
Rating: 5.0 / 5

Felt like I discovered a hidden gem! Kent is great and the floating cabin was a DREAM. Highly recommend.

Emily September 30 2025
Rating: 5.0 / 5

Such a beautiful spot- remote and private- make sure to visit with people you enjoy spending quality time with to get the full impact of being immersed in the peacefulness of nature ❤️

Rich September 24 2025
Rating: 5.0 / 5

Me and my wife had a fantastic time! Beautiful place! Very peaceful! Perfect place for a relaxing romantic getaway

Kaitlyn September 23 2025
Rating: 5.0 / 5

Hit the "reserve now" button. Do it before someone else does!! Dont even read my review, just reserve this place!! I dont even know where to start with this review. Your host will ferry you to your cabin on a gorgeous, private island, what else do you need to know? We saw bald eagles, & heard loons throughout the morning. We woke up to the most beautiful sunrise. 5 stars seems like an insult to this amazing place, I wish I could give them more. We have stayed at a lot of AirBnb's, this just took first place!

Hannah September 21 2025
Rating: 5.0 / 5

Had an AMAZING time, will be returning!!!

Autumn September 19 2025
Rating: 5.0 / 5

The Nautilus house and 1BSI provides a stunning, peaceful, innovative vacation destination. Kent has clearly thought through every detail in designing the sustainability of the island. His communication is comprehensive, fun and friendly. There’s plenty of amenities, like canoeing, hammocks on floating docks, paddle boards, kayaks, gorgeous nature, fire pits, I could go on but I recommend that you experience it for yourself. Just amazing, would definitely return. Thank you Kent!!!

Owner Response
Thank you for your kind words, Autumn. We’re glad you found your natural sweet spot during your visit.
Surbhi September 16 2025
Rating: 5.0 / 5

This place and experience is magical! Kent and his crew ho out of their way to make sure your stay is as relaxing and enjoyable as it can be! The island is private and the location is gorgeous. We stayed in the water house. One of the most unique experiences! We will be back, thank you Kent and team! :)?

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Nautilus Water House FAQs

What's special about the Nautilus Waterhouse?

The Nautilus is a floating waterhouse docked at the island - offering a unique on-the-water stay with stunning lake views and immediate access to swimming and paddling.

Is the Nautilus Waterhouse off-grid?

Yes. Like all 1BSI stays, the Nautilus is off-grid by design, using thoughtful systems that balance sustainability with comfort.

What's included in this stay?

A cozy sleeping space, cooking gear, hot shower/bathroom access on the island, firewood, canoe or kayak use, and access to a hammock swim dock, boat dock, and swimming spots.

How do I access the Nautilus Waterhouse?

You'll arrive on your front porch by boat.