paragraph_text: Mayombe (or Mayumbe) is a geographic area on the western coast of Africa occupied by low mountains extending from the mouth of the Congo River in the south to the Kouilou-Niari River to the north. The area includes parts of the Democratic Republic of the Congo, Angola (Cabinda Province), the Republic of the Congo and Gabon.

paragraph_text: The Poplar River is a river in Manitoba and Ontario, Canada. It is in the Hudson Bay drainage basin and flows to the eastern shore of Lake Winnipeg. The river passes through one of the last, large, and intact boreal forests in the world.

paragraph_text: Fighting in North Africa started with the Italian declaration of war on 10 June 1940. On 14 June, the British Army's 11th Hussars (assisted by elements of the 1st Royal Tank Regiment, 1st RTR) crossed the border from Egypt into Libya and captured the Italian Fort Capuzzo. This was followed by an Italian counter-offensive into Egypt and the capture of Sidi Barrani in September 1940 and again in December 1940 following a British Commonwealth counteroffensive, Operation Compass. During Operation Compass, the Italian 10th Army was destroyed and the German Afrika Korps -- commanded by Erwin Rommel, who later became known as ``The Desert Fox ''-- was dispatched to North Africa in February 1941 during Operation Sonnenblume to reinforce Italian forces in order to prevent a complete Axis defeat.

paragraph_text: West of the Rocky Mountains lies the Intermontane Plateaus (also known as the Intermountain West), a large, arid desert lying between the Rockies and the Cascades and Sierra Nevada ranges. The large southern portion, known as the Great Basin, consists of salt flats, drainage basins, and many small north-south mountain ranges. The Southwest is predominantly a low-lying desert region. A portion known as the Colorado Plateau, centered around the Four Corners region, is considered to have some of the most spectacular scenery in the world. It is accentuated in such national parks as Grand Canyon, Arches, Mesa Verde National Park and Bryce Canyon, among others. Other smaller Intermontane areas include the Columbia Plateau covering eastern Washington, western Idaho and northeast Oregon and the Snake River Plain in Southern Idaho.

paragraph_text: Mil plain is a plain in Azerbaijan. It is located on the bank of the Aras river and extends to Iran. Mil-plain is located in the southwest part of the Kur-Araz lowland, where the Kura and Araz rivers meet. The area is between the right bank of the Kura River and the left bank of the Araz River. The north-eastern part of the plain is lower than the ocean level. In the south-west, these areas are covered by sand, gravel. More than 40 percent of the altitude in the plain is 0-100 meters, 25 percent - 100-200 meters above sea level, and 35 percent - absolute altitude is less than 0 meters. The absolute altitude decreases about 8 m to north (to the Kura River) and varies from 200 to 250 to the west (harami plain). The plain includes mainly the areas of Imishli and Beylagan districts. Seismic activity is high as the plain is in the convergent border the Alpine-Himalayan orogenic belt.

paragraph_text: Gibson Lake is a lake in geographic Biggar Township, Nipissing District in Northeastern Ontario, Canada. It is in the Saint Lawrence River drainage basin and lies within Algonquin Provincial Park. The major outflow, at the southwest, is Gibson Creek which flows to the Nipissing River, and then via the Petawawa River and the Ottawa River to the Saint Lawrence River.

paragraph_text: The Republic of the Congo (French: République du Congo), also known as Congo, Congo Republic, West Congo[citation needed], or Congo-Brazzaville, is a country located in Central Africa. It is bordered by five countries: Gabon to the west; Cameroon to the northwest; the Central African Republic to the northeast; the Democratic Republic of the Congo to the east and south; and the Angolan exclave of Cabinda to the southwest.

paragraph_text: The Tumen River, also known as the Tuman River or Duman River (), is a long river that serves as part of the boundary between China, North Korea and Russia, rising on the slopes of Mount Paektu and flowing into Sea of Japan. The river has a drainage basin of 33,800 km (13,050 sq mi).

paragraph_text: Pingtung Plain () is a plain area including parts of Pingtung County and Kaohsiung City in Taiwan. It includes the alluvial fan of Kaoping River, which forms the largest drainage area of rivers in Taiwan, and also passed by other shorter rivers such as Tungkang River, Linbian River and Shihwen River (士文溪). The plain faces the Taiwan Strait on the southwest, lies to the east of Kaohsiung City, and at the west of Central Mountain Range.

paragraph_text: Blizzard Mountain Ski Area is a modest ski area in the western United States, in central Idaho. It is located in the southern tip of the Pioneer Mountains in southwestern Butte County, southwest of Arco. The elevation of its lift-served summit is above sea level, with a vertical drop of on a treeless, northeast-facing slope. The summit offers a sweeping view of the vast Snake River Plain to the east, south, and west.

paragraph_text: The Mississippi River is the chief river of the second - largest drainage system on the North American continent, second only to the Hudson Bay drainage system. Flowing entirely in the United States (although its drainage basin reaches into Canada), it rises in northern Minnesota and meanders slowly southwards for 2,320 miles (3,730 km) to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 31 U.S. states and 2 Canadian provinces between the Rocky and Appalachian Mountains. The Mississippi ranks as the fourth - longest and fifteenth - largest river in the world by discharge. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.

paragraph_text: Lefini River is a river of the Republic of Congo and a tributary of the Congo River. Henry Morton Stanley reached the confluence on 9 March 1877.

paragraph_text: The direct involvement of the Netherlands in World War II began with its invasion by Nazi Germany on 10 May 1940. The Netherlands had proclaimed neutrality when war broke out in September 1939, just as it had in World War I, but Adolf Hitler ordered it to be invaded anyway. On 15 May 1940, one day after the bombing of Rotterdam, the Dutch forces surrendered. The Dutch government and the royal family escaped and went into exile in London.

paragraph_text: Jean Malonga (February 25, 1907 in Kibouende, French Congo – 1985) is credited as one of the earliest of the modern Republic of Congo writers. Prior to Malonga, Congolese literature in Brazzaville consisted of scattered pre-World War II French language works. He began his career as a writer in the Congolese language magazine "Liaison". He was also a Congolese politician who served in the French Senate from 1948 to 1955.

paragraph_text: Albert G. Mumma (2 June 1906 – 15 July 1997) was a rear admiral in the United States Navy who played a pivotal role in the development of nuclear propulsion for warships. During World War II, he served in France and Germany with the Alsos Mission.

paragraph_text: The 3rd Guards Brigade was an infantry brigade of the British Army in World War I. It was formed in France in August 1915 with two battalions already on the Continent and another two from England. It served with the Guards Division on the Western Front for the rest of the war.

paragraph_text: The Mississippi River is the chief river of the second - largest drainage system on the North American continent, second only to the Hudson Bay drainage system. The stream is entirely within the United States (although its drainage basin reaches into Canada), its source is Lake Itasca in northern Minnesota and it flows generally south for 2,320 miles (3,730 km) to the Mississippi River Delta in the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 31 U.S. states and two Canadian provinces between the Rocky and Appalachian Mountains. The Mississippi ranks as the fourth - longest and fifteenth - largest river in the world by discharge. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.

paragraph_text: The southwest of the country is a coastal plain for which the primary drainage is the Kouilou-Niari River; the interior of the country consists of a central plateau between two basins to the south and north. Forests are under increasing exploitation pressure.

paragraph_text: The Battle of Mohi (today Muhi), also known as Battle of the Sajó River or Battle of the Tisza River (11 April 1241), was the main battle between the Mongol Empire and the Kingdom of Hungary during the Mongol invasion of Europe. It took place at Muhi, southwest of the Sajó River. After the invasion, Hungary lay in ruins. Nearly half of the inhabited places had been destroyed by the invading armies. Around 15–25 percent of the population was lost, mostly in lowland areas, especially in the Great Hungarian Plain, the southern reaches of the Hungarian plain in the area now called the Banat and in southern Transylvania.

paragraph_text: The Luvua River (or "Lowa River") is a river in the Katanga Province of the Democratic Republic of the Congo (DRC). It flows from the northern end of Lake Mweru on the Zambia-Congo border in a northwesterly direction for to its confluence with the Lualaba River opposite the town of Ankoro. The Lualaba becomes the Congo River below the Boyoma Falls.

Question: When did Germany invade the continent where the river serves as drainage for the southwest plain of the Congo located in WWII?
Answer: in February 1941