1 Big Sustainable Island

Floating Island Retreat: Lakefront Cabin w/ Sauna

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

Quick Answer: Floating Island Retreat: Lakefront Cabin w/ Sauna 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 143 Reviews

Jen June 01 2025
Rating: 5.0 / 5

The Nautilus is an amazing place to stay! Would absolutely go back again!

Jen May 30 2025
Rating: 5.0 / 5

I couldn’t have been happier. Paradise!

Kaden May 21 2025
Rating: 5.0 / 5

Very thorough! Beautiful place and kind folks.

Emily May 17 2025
Rating: 5.0 / 5

Kent and Heather are incredibly friendly and helpful. Kent is especially responsive, always ensuring we had everything we needed in a timely manner. 1BSI is a secluded and peaceful island—the perfect escape. The thoughtful design of the cabin and its surroundings allowed us to fully unwind and embrace the true "island life."<br/>If you're looking for a special staycation with minimal intrusion from the outside world, this is the place to be!

Holly May 04 2025
Rating: 5.0 / 5

This was our second stay with Kent. The first time we stayed at naughty dog island (and absolutely loved it!!!) and this time We came to 1BSI to stay at the nautilus. Cozy space, peaceful, quiet. Exactly what we needed this go around. Will be back again- we live this place. Kent and Heather have a well oiled machine- and along with being incredible hosts, they also work hard to give their guests the best experiences. And it shows! Thank you again, Kent & Heather!

Kelley April 20 2025
Rating: 5.0 / 5

We had such a wonderful experience! Kent has thought of everything and was super helpful and responsive. The entire adventure from start to finish was so unique, peaceful and well-done. Thank you! We will be back.

Lauren November 10 2024
Rating: 5.0 / 5

Such a great and unique stay. The views are incredible and so is the peaceful atmosphere. We could see the sunrise from the bed which was magical. The hosts Kent and Heather were so helpful and accommodating. Would definitely recommend staying at 1BSI!

Peter November 05 2024
Rating: 5.0 / 5

Had a great stay at the Nautalis house! Kent was super helpful with anything we needed during our stay. Excited to come back in the summer when the weather is a bit better. Very peaceful and secluded. Plenty of privacy from houses on the island.

Steph November 02 2024
Rating: 5.0 / 5

This was probably the best outdoor friendly stay we have ever had! The island is absolutely beautiful, the Nautilus is so cute and cozy, everything is so clean, and Kent is an awesome host! We will be back as soon as we can, we really did not want to leave.<br/>Can’t rate this place high enough! Deserves far more than five stars.

Sandra October 30 2024
Rating: 5.0 / 5

we had an amazing stay

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.