Lacul Ursu este cel mai mare lac helioterm din lume, este singurul lac cu apă sărată înconjurat de o vegetaţie bogată, lucru datorat solului vulcanic depus în timp şi este singurul lac natural din lume despre care se cunoaşte data exactă la care s-a format.
Numele lacului ţine de forma sa, asemănată cu o piele de urs. Acesta se află la o altitudine de 502 m, pe un munte de sare de 3 km adâncime şi are o suprafaţă de 40.235 m, adâncimea de 18,10 m, lăţimea de 170 m şi o salinitate medie de 250g/l.
Lacul Ursu este înscris în lista monumentelor naturale ale României, iar apa acestuia deţine proprietăţi unice în intreaga Europă şi este recomandată pentru băi de aproximativ 20 -30 de minute pentru tratarea diferitelor afecţiuni reumatice, endocrinologice sau cardiovasculare.
De asemenea, nămolul care se formează pe fundul lacului este şi el folosit în diverse tratamente.
Fenomenul de heliotermie al lacului, a fost descoperit în jurul anului 1900, fiind determinat de “stratificaţiile concentraţiilor saline ale apei lacului şi încălzirea inegală a acestor straturi de către radiaţia solară”, scrie Gândul.info
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1741781917/f29beb4918a148fc670e9fea208b6be7-t.jpg)
:format(webp):quality(90)/https://www.descopera.ro/wp-content/uploads/2016/05/15324103/1-lacul-ursu.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1589795485/ec278207f806a81d9ec72f617c8e9acf-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1589795423/d11c9995766b69e3057a16167d5bb364-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1766046944/ed0b7b45a03d67011a69e3dc2a2b3510-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1687506106/084e91261628214b2f444fbc49132a68-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1619101788/07c04f173ec464df6afdd4415adcc581-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1604659743/5754245f5c3cc39a7d8e02dfebd6ca70-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1741781930/5bef1a7091bc5ea5118ede33b3fd9f61-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1589795438/2d7c4514a1c1d832d978289d42f4de71-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2025/03/1589795452/5eb2647afb5148b0ff24692b4fa1d8be-t.jpg)
:format(wepb):quality(80)/https://www.descopera.ro/wp-content/uploads/sfm/2026/07/1593777592/5363d9166218934c6f28efc3ab22ec7d-t.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/San-Sebastian-shutter_Descopera-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2025/01/Exercitiile-fizice-nu-ard_shutterstock_descopera-9-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/Kurt-Lewin-profi_Descopera-1024x735.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2025/09/Celulele-stem-umane-devin-mai-active_shutterstock_descopera-3-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/06/vaccin-anti-coronavirusuri-fara-ace_shutterstock_descopera-6-1024x682.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/Acidificarea-oceanelor-ar-putea-micsora-creierul_shutterstock_descopera-10-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/istoria-justitiei-shutter_Descopera-1024x700.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2025/10/prima-harta-3D-a-unei-exoplanete_shutterstock_descopera-5-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2025/06/ceas-timp-univers-shutter-descopera-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/antrenamentele-pentru-picioare_shutterstock_descopera-10-1024x583.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/dezvalui-lacrimile-despre-creierul-tau_Neftali-Lenin-Villarreal-Carreno_eurekalert_descopera-1024x828.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/literatura-mark-twain-shutter_Descopera-1024x506.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/07/Concentratii-record-de-aur_MARUM_wiki_cc-by-40_descopera-1024x768.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2025/09/Apple-lege-europa-shutter_Descopera-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/02/Donald-Trump-shutter_Descopera-1024x576.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2026/04/De-ce-vorbim-in-somn_shutterstock_descopera-1024x683.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2023/07/Traian-Lalescu-wiki_Descopera-1024x630.jpg)
:format(webp):quality(80)/https://www.descopera.ro/wp-content/uploads/2025/09/Volkswagen-fabrici-shutter_Descopera-1024x681.jpg)