Bulgaria has some 500 deposits of mineral waters with over 1,600 water sources. These are localised chiefly at the mountain foothills. The spa resorts of national significance are Bankya, Velingrad, Sandanski, the mineral baths of Stara Zagora, Narechen, Sliven and Haskovo, as well as Kyustendil, Varshets, Pavel Banya, Hissarya, Merichleri, Momin Prohod, and Kostenets. Climatic sea-side resorts offering various recreation services are Albena, Balchik, Bourgas, Varna (Zlatni Pyassatzi – Golden Sands), Kiten, Pomorie, Primorsko, Nessebur (Slantchev Bryag – Sunny Beach) and Sozopol. Picturesque lakes hide in the folds of the Rila and Pirin mountain ranges. Reservoirs of recreational potential are to be found in the Rhodope Mountains – namely Batak, Vatcha, Studen Kladenets, at the foot of the Balkan Range – Ticha, as well as in some other places. There are good prerequisites for the development of adventure tourism: wild waters– rafting and canoe, diving, delta and para glidting in the river valleys of Vatcha, Iskar, Chepelarska, Struma, and Mesta rivers.