Question: Lop Nur and Lake Tritriva, are which type of land mark?
Context: Lop Nur or Lop Nor (from a Mongolian name meaning "Lop Lake") is a former salt lake in China, now largely dried-up, located between the Taklamakan and Kumtag deserts in the southeastern portion of Xinjiang Uygur Autonomous Region in the People's Republic of China.  Administratively, the lake is in Lop Nur township ( pinyin: Luóbùpō zhèn, also known as Luozhong 罗中, pinyin: Luó zhōng) of Ruoqiang County, which in its turn is part of the Bayingolin Mongol Autonomous Prefecture. Test No. 6 is the codename for China's first test of a three-staged thermonuclear device and, also its sixth nuclear weapons test.  The device was detonated at Lop Nur Test Base, or often dubbed as Lop Nur Nuclear Weapon Test Base, in Malan, Xinjiang, on 17 June 1967.  With successful testing of this three-stage thermonuclear device, China became the fourth country to have successfully developed a thermonuclear weapon after the United States, Soviet Union and the United Kingdom.  It was dropped from a Hong-6 (Chinese manufactured Tu-16) and was parachute-retarded for an airburst at 2960 meters.  The bomb was a three-stage device with a boosted U-235 primary and U-238 pusher.  The yield was 3.3 megatons. Hami–Lop Nur Railway or Haluo Railway (), is a railway in the eastern part of the Xinjiang Uyghur Autonomous Region of China between Hami and Lop Nur.  The line is 374.83 km long and began commercial operation on November 29, 2012.  Construction began in August 2010 and track laying was completed in late July 2012.  The line is mainly used to ship potassium salts mined near Lop Nur. Lop Nur Wild Camel National Nature Reserve () protects one of the three remaining habitats of the Wild Bactrian camel (Camelus ferus), a critically endangered species.  The reserve stretches around the north, east, and south of Lop Nur, a dry lake in a desert known as the "Sea of Death", and one of the most arid regions in the world.  The reserve was established in 1986 by Xinjiang Province, and has been modified over the years.  The reserve is under pressure from new new roads in the area, development of mining interests, and illegal hunting.  The area was formerly used as China's nuclear test site. Lake Tritriva is a volcanic lake in southwest-central Madagascar, in the region of Vàkinankàratra, located near the village of Belazao.  The lake fills an extinct crater in a region notable also for the presence of many hot springs.  It sits in the vent of an oval volcanic cone enclosed in vertical gneiss cliffs.  The lake's water level drops during the rainy season and rises when the monsoon rains have ceased. 596, originally named by the US intelligence agencies Chic-1, is the codename of the People's Republic of China's first nuclear weapons test, detonated on October 16, 1964, at the Lop Nur test site.  It was a uranium-235 implosion fission device made from weapons-grade uranium (U-235) enriched in a gaseous diffusion plant in Lanzhou.  The bomb had a yield of 22 kilotons, comparable to the Soviet Union's first nuclear bomb RDS-1 in 1949 and the American Fat Man bomb dropped on Nagasaki, Japan in 1945.  With the test, China became the fifth nuclear power.  This was the first of 45 total nuclear tests China has conducted to date, all of which occurred at the Lop Nur test site. Shanshan (; Uyghur: پىچان ‎, ULY: "Pichan", UYY: "Piqan" ) was a kingdom located at the north-eastern end of the Taklamakan Desert near the great, but now mostly dry, salt lake known as Lop Nur.  It was previously known as Loulan Kingdom or Kroran, but was renamed Shanshan after the king of Kroran was assassinated by a Chinese envoy in 77 BCE, and thereafter was intermittently under the control of China. The Tarim River (Mandarin Tǎlǐmù Hé, 塔里木河; Uyghur: تارىم دەرياسى, Тарим дәряси), known in Sanskrit as the Śītā is an endorheic river in Xinjiang, China.  It is the principal river of the Tarim Basin, a desert region of Central Asia between the Tian Shan and Kunlun Mountains.  The river historically terminated at Lop Nur, but today reaches no further than Taitema Lake before drying out. The Lop Desert, or the Lop Depression, is a desert extending from Korla eastwards along the foot of the Kuruk-tagh (meaning Dry Mountain) to the formerly terminal Tarim Basin in the Xinjiang Uyghur Autonomous Region of China.  It is an almost perfectly flat expanse with no topographic relief.  Lake Bosten in the northwest lies at an altitude of 1,030 m to 1,040 m (3,380 to 3,410 ft), while the Lop Nur in the southeast is only 250 m lower. Loulan, also called Krorän or Kroraina (; Uyghur: كروران, Кроран ‎, ULY: "Kroran" ) and known to Russian archaeologists as "Krorayina", was an ancient kingdom based around an important oasis city along the Silk Road already known in the 2nd century BCE on the northeastern edge of the Lop Desert.  The term Loulan is the Chinese transcription of the native name Krorän and is used to refer to the city near Lop Nur as well as the kingdom.
Answer: lake