In fact these are the Bourgas salt pit – the biggest natural open air Spa centre in Bulgaria. The red lye is a natural balm with proven healing qualities for the locomotive system, skin diseases and even just simple colds. The healing mud has positive impact on the nervous system and gynecological diseases, claim specialists. According to doctor Diana Borisova, the healing procedures should be performed early in the morning or before dusk. The treatment should be at least 10 days. Mostly women choose to take advantage of the healing properties of the mud, mostly because it has anti age effect.