Photo by Willtron, via Wikimedia Commons (CC0)
🇪🇸 Spain · Aragón
Photo by Willtron, via Wikimedia Commons (CC0)
🇪🇸 Spain · Aragón
♨ Temperature
33.5°C
⛰ Altitude
636 m
⚗ pH
7.2
💧 TDS
1340 mg/L
🌊 Flow rate
18 L/s
📅 Established
1832
✓ Verified on 2026-07-22
Balneario Termas Pallarés at Alhama de Aragón is one of Spain's oldest and most architecturally intact thermal resorts. The sulphurous-bicarbonated springs emerge at 33–35°C from limestone bedrock in the Jalón River valley. The establishment has operated continuously since 1832, when a Royal Order recognized the waters' therapeutic properties. The resort complex — featuring Belle Époque architecture, thermal pools, and landscaped gardens — was built partly to serve the emerging rail traffic on the Madrid–Barcelona line. Crucially, Alhama de Aragón has its own Renfe station directly at the resort gates, one of the few remaining examples in Spain where passengers step off the train and walk metres to a working balneario.
| Sulphur (H₂S) | 3.2 mg/L |
| Bicarbonate | 612 mg/L |
| Sodium | 210 mg/L |
| Calcium | 148 mg/L |
| Magnesium | 38 mg/L |
The springs at Alhama de Aragón have been documented since Roman times, when they were known as Aquae Bilbilitanorum. The current balneario dates to the 19th century and is one of the best-preserved examples of Spanish thermal architecture from the Belle Époque period. A Royal Order of 1832 officially recognized the waters for therapeutic use.
Alhama de Aragón sits in the Jalón valley along the old Roman road connecting Hispania's interior. The balneario became a destination for the Spanish aristocracy and bourgeoisie during the late 19th century, and its architecture reflects that golden age of spa tourism. The Jalón River and the limestone canyon create a landscape that has shaped local identity for millennia.
The springs flow naturally from artesian pressure in the Jalón limestone aquifer, requiring no pumping. The Jalón valley is a designated Nature Reserve of the Iberian System, and the balneario's grounds include protected riparian habitat along the river.
Websitewww.termaspallares.com
AddressCtra. Nacional II, km 231, 50230 Alhama de Aragón, Zaragoza, Spain