Question: Lake Tana and Lake Sary-Chelek, are natural lakes?

full_context: Document 1: Qinghai Lake: Qinghai Lake (), Kokonor (Mongolian: Хөх нуур ) or Tso Ngonpo (Tibetan: མཚོ་སྔོན་པོ། ) is the largest lake in the People's Republic of China. Located in Qinghai province on an endorheic basin, Qinghai Lake is classified as a saline and alkaline lake. Qinghai Lake has a surface area of 4317 km2 ; an average depth of 21 m , and a maximum depth of 25.5 m as measured in 2008. The current Chinese name "Qinghai," the older Mongolian name "Kokonor", and the Tibetan name translate to "Green Sea", "Blue Lake" and "Teal Sea", respectively. Qinghai Lake is located about 100 km west of the provincial capital of Xining (Tib:Ziling ཟི་ལིང་།) at 3205 m above sea level in a hollow of the Tibetan plateau. Twenty-three rivers and streams empty into Qinghai Lake, most of them seasonal. Five permanent streams provide 80% of total influx.
Document 2: Gara-Gel State Reserve: Gara-Gel State Reserve or Qaragol State Reserve was established on the area of 240 hectares in 1987 for protection and preservation of rare ecological system of the lake of glacial origin and natural complexes surrounding the water basin. The lake feeds mainly from rains and spring water. Lake Ishigli-Gara-Gel is situated at a height of 2, 658 m above sea level in the southern part of the Karabakh volcanic plateau near the foothills of several mountains with a height of 3, 200-3, 500 m. the lake is a relict water reservoir, which was formed in the crater of an extinct volcano. The length of the lake is 1,950 m, its maximum width is 1, 250 m, length of its coastline is 5, 500 m, maximum depth – 7.8 m, volume of water – 10 million m3, area of the lake 13 km2. Water flow is mainly due to melted snow and rainwater, partially spring water. In terms of botany and geography the Karabakh Plateau is situated between the Caucasian and Armenian-Iran provinces, which determines the specifics of the local flora. The flora of the reserve includes 102 species and subspecies of vascular plants from 68 general and 27 families. The lack of flora is explained by the fact that the reserve covers only the lake, and many rare and endemic species grow beyond the reserve area, but close to its borders. The vegetation of the coastal area of the lake is represented mainly by meadows with the dominance of Trifolium and Tragacantha and Astragalus. The swamp flora and vegetation are limited because of the height of the area. There are only two species of plants in the lake: Polygonum amphibium and Ranunclus. In 1967, a type of Sevan trout, included in the Red Book, was introduced into the lake. The reserve is an inter-republic reserve. The reserve is under occupation. Adjacent to the borders of the reserve there are areas with rare and endangered species of plants such as Euphrasia, Potentilla and others.
Document 3: Lake Tana: Lake Tana (also spelled T'ana, Amharic: , "Ṭana Ḥäyq ", "T’ana Hāyk’ "; an older variant is Tsana, Ge'ez: ጻና "Ṣānā"; sometimes called "Dembiya" after the region to the north of the lake) is the source of the Blue Nile and is the largest lake in Ethiopia. Located in Amhara Region in the north-western Ethiopian Highlands, the lake is approximately 84 kilometers long and 66 kilometers wide, with a maximum depth of 15 meters, and an elevation of 1,788 meters. Lake Tana is fed by the Lesser Abay, Reb and Gumara rivers. Its surface area ranges from 3,000 to 3,500 km², depending on season and rainfall. The lake level has been regulated since the construction of the control weir where the lake discharges into the Blue Nile. This controls the flow to the Blue Nile Falls (Tis Abbai) and hydro-power station.
Document 4: Zege Peninsula: Zege Peninsula is located on the southern shore of Lake Tana in Ethiopia, and is situated at (11° 40’ to 11° 43’ N and 37 °19’ to 37 °21’ E). It is 600 km northwest of Addis Ababa, the capital city of Ethiopia. Lake Tana is the largest lake in Ethiopia, and is the source of the Blue Nile river. Zege peninsula is attached to dry land on its western part. As a place name, the word "zege" signifies a peninsula that encloses two rural qebele, the former monastery and Zägé town at the gate of the main land of the peninsula. At present, Zegé is part of Bahir Dar city administration, and is 32 km from the main town, the capital of Amhara National Regional State. The origin of the term "zegié" is somewhat obscure. Informants from Ura Kidane miheret monastic church, one of the earliest church in the peninsula associated the term to Debra Zegag and Abba Nahom; where as some monks who were servants of Mähal Zegié Giyorgis attributed the term to Zengie (my shaft) and to Abun Betre Maryam, founder of Zegie monastery. Still another church scholar, Aleqa Aynakulu Mersha, related the term to a name of a tribe called Zegie (Aleqa Aynekulu) 1955 E.C:466; Tadese Tamrat, 1994:954-959). On the peninsula of Zege there are six Monastic churches, all established between the 14th and 17th centuries.
Document 5: Lake Karachay: Lake Karachay (Russian: Карача́й ), sometimes spelled Karachai or Karachaj, was a small lake in the southern Ural mountains in central Russia. Starting in 1951, the Soviet Union used Karachay as a dumping site for radioactive waste from Mayak, the nearby nuclear waste storage and reprocessing facility, located near the town of Ozyorsk (then called Chelyabinsk-40). Today the lake is completely infilled, acting as "a near-surface permanent and dry nuclear waste storage facility."
Document 6: Nako Lake: Nako Lake is a high altitude lake in the Pooh sub-division of the Kinnaur district. It forms part of the boundary of Nako village and seems that the village is half buried in the lake's border. It is about 3662 m above sea level. The lake is surrounded by willow and poplar trees. Near the lake there are four Buddhist temples. Near this place there is a footlike impression ascribed to the saint Padmasambhava. Several miles away there is a village called Tashigang around which there are several caves where it is believed that Guru Padmasambhava meditated and gave discourse to followers. There is a waterfall nearby which has snow water falling like a river of milk. Legend says that it is a heavenly realm of fairies. In one of the caves you are still able to see the live footprints of these fairies or other demigods. It is a sacred place for the people of these valleys. Followers come from as far a place as Ladhak and spiti valley.
Document 7: Pari Lake: Pari Lake is located at the highest altitude approx: 14,442 ft above sea level, in the mountain ranges of Utror Valley, Kalam, Swat Valley, Khyber Pakhtunkhwa, Pakistan. It is comparatively greater in size and depth than the other lake situated in its vicinity and remains open in the months of July till September. The western face of the lake is open and its water flows down to the gigantic Kundol Lake which is situated in the foothills.
Document 8: Lake Tanganyika: Lake Tanganyika is an African Great Lake. It is the second oldest freshwater lake in the world, second largest by volume, and the second deepest, in all cases after Lake Baikal in Siberia; it is also the world's longest freshwater lake. The lake is divided among four countries – Tanzania, Democratic Republic of the Congo (DRC), Burundi, and Zambia, with Tanzania (46%) and DRC (40%) possessing the majority of the lake. The water flows into the Congo River system and ultimately into the Atlantic Ocean.
Document 9: Bala Lake: Bala Lake (] ; Welsh: "Llyn Tegid" , ] ; its correct name, being Llyn Tegid in Welsh) is a lake in Gwynedd, Wales. The name Tegid may be related to Welsh "teg", meaning "fair". It was the largest natural body of water in Wales before its level was raised by Thomas Telford to help support the flow of the Ellesmere Canal. It is 3.7 mi long by 0.5 mi wide, and is subject to sudden and dangerous floods. The River Dee runs through it and the waters of the lake are famously deep and clear. The town of Bala sits at its north-eastern end and the narrow gauge Bala Lake Railway runs for 3 mi along the lake's south-eastern shore, and continues south-westward to the village of Llanuwchllyn (whose name means "church ['llan'] above ['uwch'] the lake ['llyn'").
Document 10: Dengel Ber: Dengel Ber is a town in western Ethiopia. Located on the south-western shore of Lake Tana in the Semien Gondar Zone of the Amhara Region, this town has a latitude and longitude of . Access to this town includes track roads to both Shawra and Kunzela and weekly service by the Bahir Dar-Gorgora ferry on Lake Tana. While the name of the town is indisputably Amharic, there is some disagreement over the meaning of its name: while "Pass of the Virgin" has been the most common interpretation since at least the days James Bruce visited Ethiopia, Huntingford and Beckingham state that it means "pass of "canna" plants".
Document 11: East Central Saskatchewan: East Central, Saskatchewan is a geographic region consisting of parkland, prairie, rolling hills and forest. Settled by English, French, Germans, Hungarians, Icelanders, Poles and Ukrainians in the late 19th century and early 20th century, makes this area very culturally diverse. Predating European settlement were the First Nation peoples; the Cree and Saulteaux. The city of Yorkton is the largest centre in the region which is located on the Yellowhead highway. There are many lakes to enjoy throughout the year such as Fishing Lake, Good Spirit Lake, Last Mountain Lake, Madge Lake and Wakaw Lake to name a few. There are also hills with scenic hiking trails located in the: Duck Mountain, Minnichinas Hills, Pasqua Hills, Porcupine Hills.
Document 12: Sarygamysh Lake: The Sarygamysh Lake, also Sarykamysh or Sary-Kamysh (Turkmen: Sarygamyş köli , Uzbek: 'Sariqamish ko‘li' , Russian: Сарыкамы́шское озеро ), is a lake situated in Central Asia. It is geographically located approximately midway between the Caspian Sea and the Aral Sea. The northern quarter of the lake belongs to the country of Uzbekistan, while the rest belongs to Turkmenistan.
Document 13: Lake Sary-Chelek: Sary-Chelek (also Sarychelek, Kyrgyz: Сарычелек) is a mountain lake located in Sary-Chelek Nature Reserve in Jalal-Abad Province in Western Kyrgyzstan. It is north of Arkit (the park headquarters) at the eastern end of the Chatkal Range. There are a number of smaller lakes in the area.
Document 14: Lake Tana Biosphere Reserve: The Lake Tana Biosphere Reserve is located in the Amhara National Regional State approximately 563 km northwest of Addis Ababa in the north-western part of Ethiopia. The biosphere reserve comprises Lake Tana, the largest lake in Ethiopia, the main source of the Blue Nile, which provides important ecosystem services. The area is a hotspot of biodiversity, internationally known as an Important Bird Area and is of global importance for agricultural genetic diversity. The area is characterized by an enormous heterogeneity of land uses and natural ecosystems.
Document 15: Besh-Aral State Nature Reserve: Besh-Aral State Nature Reserve was established on March 21, 1979 to preserve the unique natural complex and forests of the Chatkal valley, as well as to protect the habitat of the Menzbier's Marmot and to protect the natural habitat of vegetation of Greig and Cauffman tulips. The area of the reserve amounted to 116,700 hectares. In 1994,in regard with the establishment of Chatkal Forestry the boundaries of the reserve were changed and area reduced to 63,200 hectares (Government Decree No 573 of August 1, 1994). On July 16, 2002 the habitats of Menzbir's marmot (Marmota menzbieri) and other areas were re-subordinated to the nature reserve, and its area increased to 86,748 hectares (Government Decree No 499 of July 26, 2002). In 2006, extension of the Besh-Aral State Nature Reserve with Sandalash reserve area increased the total area up to 112,018 hectares.
ground_truth: yes