Title: Laohu Valley Reserve
Content:  The Laohu Valley Reserve is one of the largest protected areas in South Africa, comprising an area of approximately 378 km2. It is located in the central region of the country. It takes in land near Philippolis in the Free State section, which consists of approximately 232 km2 on the northern side, and spans part of the Orange River (including the upper reaches of the Vanderkloof Dam) in the Northern Cape section, which consists of approximately 146 km2 on the southern side. The Free State side of the reserve consists of tiger camps bordered by 6000 km of fence.
Title: Hetao
Content:  Hetao is a C-shaped region in northwestern China consisting of a collection of flood plains stretching from the banks of the northern half of the Ordos Loop, a large northerly rectangular bend of the Yellow River that forms the river's entire middle section. The region makes up the northern margin of the Ordos Basin, bounded in the west by the Helan Mountains, the north by the Yin Mountains, the east by the northern portion of Lüliang Mountains, and the south by the Ordos Desert and the Loess Plateau (separated by the course of the Ming Great Wall). The Hetao region is divided into two main sections — the "West Loop" in Ningxia, and the "East Loop"  in Inner Mongolia. The west section includes 
Title: Last Ice Area
Content:  The Last Ice Area covers the central area of the Arctic Circle, thereby representing the most northerly coastal zone of the world. It is so named because of its old and thick ice sheet which is expected to last the longest as a sea ice in the Arctic. The northern side falling under the Government of Canada is declared the Tuvaijuittuq Marine Protected Area, the largest protected area in Canada. Due to its environmental concerns and ecological impact it can have, a number of areas are proposed for protection, including Tallurutiup Imanga National Conservation Area, Pikialasorsuaq, and Nunavut protected areas.
Title: Last Ice Area
Content:  The Last Ice Area is broadly the large interior polar region of the Arctic Circle covering an area between the northern edge of Greenland and the Canadian Arctic Archipelago and is the most northerly coastal zone of the world. Being in a permafrost landscape, it is the oldest and thickest ice sheet in the Arctic and is expected to persist longest as a sea ice. Towards the northern side, it consists of the Tuvaijuittuq Marine Protected Area, which is the largest protected area in Canada and among the largest protected areas in the world. It is one of the major centres of environmental concerns that is bound to have global impact. The Arctic Council's 2017 report ''Snow, Water, Ice and Permafrost. Summary for Policy-makers'' predicted that current rate of climate change will cause the complete disappearance of the ice within a century.
Title: Hoh Xil
Content:  The region covers 83,000 square kilometres at an average elevation of 4,800 metres above sea level, stretches in the east-west direction between the Tanggula and Kunlun mountain chains in the border areas of southwest China's Tibet Autonomous Region, northwest China's Qinghai Province and China's Xinjiang Uyghur Autonomous Region. The southeastern part of the Hoh Xil, drained by the Chumar River, is one of the major headwater sources of the Yangtze River. The rest of the region is endorheic, with drainage to numerous isolated lakes; this area is sometimes described by hydrologists as the "Hoh Xil lake district". 45,000 square kilometres of the Hoh Xil region, at an average elevation of 4,600 metres, were designated a national nature reserve in 1995. The UNESCO World Heritage Site is encompassed of the western half of Zhidoi County and western part of Qumarlêb County in Qinghai. Bukadaban Feng is considered part of Hoh Xil.
Title: St Helens Important Bird Area
Content:   St Helens Important Bird Area comprises four separate sites, with a collective total area of 24 km2, in the vicinity of the town of St Helens on the northern part of the east coast of Tasmania, south-eastern Australia.
Title: Hunter Valley Important Bird Area
Content:   The Hunter Valley Important Bird Area is a 560 km2 tract of land around Cessnock in central-eastern New South Wales, Australia.
Title: Mount Hermon
Content:  The relatively narrow Hermon range, with the Lebanon-Syria boundary along its spine, extends for 70 km, from 25 km northeast of Mt. Hermon to 45 km southwest of it. The Hermon range covers an area of about 700 km2 of which about 70 km2 are under Israeli control. Mount Hermon is a cluster of mountains with three distinct summits, each about the same height. Most of the portion of Mount Hermon within the Israeli-controlled area constitutes the Hermon nature reserve.
Title: Gwaii Haanas National Park Reserve and Haida Heritage Site
Content:  park reserve and the marine reserve is a duplication of name, but not of reference. As part of the national park reserve name, it refers to the terrestrial portion of the site. As part of the marine reserve name, it refers to the marine portion of the site. Still, there are areas of the heritage site&mdash;both land and sea&mdash;which are outside both federal reserves. These are all in the northernmost parts of the site. Gwaii Haanas National Marine Conservation Area Reserve, which covers 3,400 square kilometres, is "a primary feeding habitat" of the humpback whale (North Pacific population) protected by Canada's Species at Risk Act (SARA). With the NMCAR established, nearly 5,000 square kilometres of Gwaii Haanas are protected. This is one of the only places in the world where a representative area is protected from mountain top to ocean depth.
Title: Mount Erymanthos
Content:  Oros Erymanthus. This area included GR2320008, but reached into Elis to embrace the rest of the massif, approximately doubling the protected region. GR2320012 has an area of about 39020.94 ha, also on land. The perimeter is about 120.6 km. A representative NE-SW distance is 28 km. A representative NW-SE distance is 16 km; that is to say, the mountainous terrain is approximately ovoid with the long axis NW-SW. The protected area is extended to the SW in GR2320002, Oropedio Folois, "Plain of Foloi," comprising Foloi Forest, protected for its birds. It is not part of the mountain. GR2320008 as a legal entity did not vanish away, which it could not 

Question: the area enclosed by hysteresis loop is a measure of?
Answer: energy loss.