Great — here are highly regarded eco‑friendly hotels and lodges across Sri Lanka (grouped by region), with a short note on what makes each sustainable so you can pick by location and travel style.

Central Highlands / Cultural Triangle

• Heritance Kandalama (near Dambulla / Sigiriya) — Longstanding benchmark for sustainable tourism: integrated design by Geoffrey Bawa, large biodiversity/forest reserve, waste‑and‑energy initiatives and recent regional responsible‑tourism awards. Good for culture + low‑impact nature stays. (amazingsrilanka.lk)

• Jetwing Vil Uyana (Sigiriya) — Built around reconstructed wetlands and paddy fields to restore habitat; strong renewable energy, water‑harvesting and recycling programs and extensive wildlife‑conservation activities (wetlands, birdlife, loris). Ideal if you want wildlife viewing from your villa. (en.wikipedia.org)

Hill Country / Kandy area

• Santani Wellness Resort (near Kandy) — Wellness/low‑impact design focused on natural ventilation, minimal AC, locally sourced materials and villas sited for minimal landscape disturbance. Good for wellness retreats and cooler hill‑country climate. (wallpaper.com)

South & Yala / Wild Coast

• Chena Huts by Uga Escapes (Yala area) — Small‑scale, nature‑focused huts offering low‑impact safari experiences; emphasizes local staff, community linkages and conservation‑aware guest activities. Good for wildlife (leopards/elephants) and eco‑camp style comfort. (Note: Chena Huts info summary based on Uga Escapes properties and reviews—see hotel page for latest conservation claims.)

South Coast / Beaches

• Anantara Peace Haven Tangalle (Tangalle) — Large resort brand that has been developing sustainability programs (marine conservation, energy and waste initiatives); better if you want high‑comfort with environmental programmes. Verify current certifications/programmes with the hotel before booking. (wallpaper.com)

Boutique and Tea‑estate Lodges

• Converted tea‑estate eco‑lodges (various: e.g., small properties around Nuwara Eliya / Ella) — many operate on restored estate land, practice organic/agroforestry methods, employ local communities and use passive design suited to the hills. Pick one with clear local‑community or conservation programmes listed on their site or third‑party reviews. (Examples: Santani’s tea‑estate setting noted above.) (wallpaper.com)

How to choose and book (quick tips)

• Look for specific credentials and practices: GSTC criteria, Travelife, ISO 14001, LEED/Green Globe or ICRT/region awards; check details on recycling, on‑site renewable energy, water harvesting and community programs. If the property cites an award, verify the award page or a recent news source. (forgoodmag.com)
• Match location to interests: cultural sites (Kandy/Dambulla/Sigiriya) vs. wildlife safaris (Yala/Udawalawe) vs. beaches (Tangalle/Galle) vs. hill‑country wellness (Kandy/Tea Country). (en.wikipedia.org)
• Ask hotels before booking: what percentage of energy comes from renewables, waste diversion rate, whether single‑use plastics are banned, community/employee programs, and local conservation partnerships. Many properties update projects yearly so confirm current numbers. (ceylontoday.lk)

If you want, I can:

• Narrow recommendations by region (e.g., only South Coast or Hill Country), budget (budget / midrange / luxury), or travel interests (wildlife, beaches, wellness), and pull direct links and up‑to‑date sustainability claims for 3–6 specific hotels.