Kleptuza, Protected natural area in Velingrad, Bulgaria

Kleptuza is a protected natural reserve in Velingrad, Bulgaria, fed by a spring that delivers water at a constant temperature. The area spans 412 hectares and includes marked trails through forests where visitors encounter diverse plant life and wildlife.

Until 1932 the spring's water ran straight into the Chepinska River, and the site of today's lakes was a marshy meadow over the river bed. In 1937 local residents built the two lakes through voluntary labour, using materials supplied by the municipality. Trees were then planted and alleys, stairs and viewing platforms laid out.

The chapel of Saint Elijah stands in the Markovi Skali area within the protected land, at a Thracian cult sanctuary. The name Kleptuza likely comes from the Greek word kleptos, meaning to hide or steal, referring to the large volume of water concealed beneath the spring.

Walking trails cut through forest areas where different seasons bring different plants and wildlife into view. Sturdy footwear works well for the terrain, and allowing time to explore at a relaxed pace helps visitors notice more of what the area offers.

The 24th parallel and the 42nd meridian cross within the protected area, a coincidence marked on no sign and noticed by few visitors. The spring itself is among Bulgaria's largest karst sources, discharging 270 to 1020 litres per second at about 8.1 °C, and part of that water is captured to supply Velingrad's taps.