Kostenets Spa is a well-established thermal bathing destination in the town of Kostenets, located in the Sofia Province of western Bulgaria at the foot of the Rila Mountain range, where the Maritsa River begins its journey across the Thracian Plain. The calcium-rich thermal waters, which emerge at temperatures of around 70°C, are among Bulgaria's most productive hot springs and are used therapeutically for musculoskeletal conditions, dermatological complaints, and general wellness. The proximity of Kostenets to both the Rila Monastery — Bulgaria's most revered Orthodox site and a UNESCO World Heritage landmark — and the Borovets ski resort makes it an appealing year-round destination.
Insider tip — Kostenets spa lies along the Maritza river headwaters where the Sub-Balkan valley narrows between the Rila and Sredna Gora ranges, making it one of Bulgaria's most scenically situated thermal complexes. The soft, enveloping calcium-mineral waters are appreciated for their soothing and restorative qualities, and the resort has maintained a spa tradition since the Bulgarian National Revival period. The Rila National Park with its famous Seven Rila Lakes is only 30 kilometers away, making this an ideal base for combining alpine hiking with relaxing soaks.
