Photo by Neslaaaay, via Wikimedia Commons (CC BY-SA 4.0)
🇮🇸 Iceland · Flúðir, South Iceland
Photo by Neslaaaay, via Wikimedia Commons (CC BY-SA 4.0)
🇮🇸 Iceland · Flúðir, South Iceland
♨ Temperature
39°C
⛰ Altitude
—
⚗ pH
—
💧 TDS
—
🌊 Flow rate
—
📅 Established
1891 (modern facility reopened 2014)
✓ Verified on 2026-07-28
The Secret Lagoon (Gamla Laugin) was originally built at Hverahólmi in 1891 and hosted Iceland's first organized swimming lessons from 1909 to 1947 before falling into disuse. Restoration began in 2005 and the modern facility reopened on June 7, 2014. The lagoon is fed by natural hot springs including Vaðmálahver and Básahver, plus the small active geyser Litli Geysir, which erupts every few minutes nearby. The water, described as warm and rich in sulfur, holds steady at 38-40°C year-round and is fully replaced roughly every 24 hours through continuous natural flow.
Built in 1891 at Hverahólmi, this is considered the site of Iceland's oldest swimming pool. It hosted the country's first organized swimming lessons from 1909 to 1947, then sat unused for decades until a restoration beginning in 2005 led to the modern facility's reopening in 2014.