Question: The Missouri Rhineland is a geographical area located mostly in a valley that is how long?

full_context: Document 1: Marias River: The Marias River is a tributary of the Missouri River, approximately 210 mi (338 km) long, in the U.S. state of Montana. It is formed in Glacier County, in northwestern Montana, by the confluence of the Cut Bank Creek and the Two Medicine River. It flows east, through Lake Elwell, formed by the Tiber Dam, then southeast, receiving the Teton River at Loma, 2 mi. (3.2 km) above its confluence with the Missouri.
Document 2: Stone Hill Winery: Stone Hill Winery is a Missouri winery located in Hermann, Missouri, along the Missouri River, in what is called the Missouri Rhineland of the Hermann AVA. Established by German immigrants in 1847, it is the largest winery in the state.
Document 3: Missouri Rhineland: The Missouri Rhineland is a geographical area of Missouri that extends from west of St. Louis to slightly east of Jefferson City, located mostly in the Missouri River Valley on both sides of the river. It is named for its similarities to the Rhineland region in central Europe, a wine growing area around the Rhine river and the German-Americans who determined that this part of Missouri would be good for grape growing. The soils of the Missouri River Valley and surrounding areas are mainly rocky residual soils, which are excellent for viticulture (growing of grapes/vineyards) though poor for most agricultural purposes. These soils were left after the carbonate (mainly limestone) bedrock weathered away to impurities of clayey soil and chert fragments. Farther to the north, glacial deposits and wind-deposited loess, a silty soil also associated with the glaciers, are intermingled with the residual soils.
Document 4: Missouri River Valley: The Missouri River Valley outlines the journey of the Missouri River from its headwaters where the Madison, Jefferson and Gallatin Rivers flow together in Montana to its confluence with the Mississippi River in the State of Missouri. At 2300 mi long the valley drains one-sixth of the United States, and is the longest river valley on the North American continent. The valley in the Missouri River basin includes river bottoms and floodplains.
Document 5: Three Forks, Montana: Three Forks is a city in Gallatin County, Montana, United States and is located within the watershed valley system of both the Missouri and Mississippi rivers drainage basins — and is historically considered the birthplace or start of the Missouri River. The population was 1,869 at the 2010 census. The city of Three Forks is named so because it lies geographically near the point, in nearby Missouri Headwaters State Park, where the Jefferson, Madison, and Gallatin Rivers converge to form the Missouri River — the longest single river in North America, as well as the major portion of the Missouri-Mississippi River System from the headwaters near Three Forks to its discharge into the Gulf of Mexico. Three Forks is part of the Bozeman, MT Micropolitan Statistical Area of approximately 100,000 people and the greater Bozeman demographic area of approximately 125,000 people.
Document 6: Wachau wine: Wachau is one of Austria's most established and notable wine regions, specializing in dry wines made from Riesling and Grüner Veltliner. Located in Lower Austria along the Danube, west of Vienna and Krems an der Donau, it is one of the westernmost wine producing regions in Austria with only a few scattered plantings in Tyrol being further west. While most of Austria follows a wine classification systems based on ripeness and harvest must weight that parallels the German wine classification system, Wachau wines have a unique classification system. The three classification levels for Wachau wine include "Steinfeder" for wines up to 11.5% alcohol level, "Federspiel" for wines between 11.5–12.5% and "Smaragd" that must have a minimum of 12.5% alcohol level. Despite its renown, the Wachau is a small wine region that usually accounts for only around 3% of Austria's wine production.
Document 7: Rheingau (wine region): Rheingau is one of 13 designated German wine regions ("Weinbaugebiete") producing quality wines ("QbA" and "Prädikatswein"). It was named after the traditional region of Rheingau (meaning "Rhine district"), the wine region is situated in the state of Hesse, where it constitutes part of the Rheingau-Taunus-Kreis administrative district. Although, making up only 3 percent of the total German vineyard area, Rheingau has been the source of many historically important innovations in German wine making, and contains many wine producers of international reputation, such as Schloss Johannisberg. Rheingau, with 3125 ha of vineyards in 2008, also boasts a higher proportion of Riesling (78.8%) than any other German wine-growing region, with Spätburgunder (Pinot noir) making up most of the rest (12.2%), followed by Müller-Thurgau (1.6%).
Document 8: Mid-Missouri: Mid-Missouri is a loosely-defined region comprising the central area of the U.S. state of Missouri. The region's largest city is Columbia (population 100,000+). The Missouri state capital, Jefferson City, and the University of Missouri are also located here. The region also includes portions of the Lake of the Ozarks, the Ozark Mountains, and the Missouri Rhineland. Mid-Missouri is centered on two contiguous metropolitan areas: the Columbia Metropolitan Area and the Jefferson City Metropolitan Area, which together have a population of over 300,000.
Document 9: Missouri: Missouri is a state in the Midwestern United States. With over six million residents, it is the 18th most populous state. The largest urban areas are St. Louis, Kansas City, Springfield, and Columbia. The capitol is in Jefferson City on the Missouri River. The state is the 21st most extensive in area. In the South are the Ozarks, a forested highland, providing timber, minerals, and recreation. The Mississippi River forms the eastern border of the state.
Document 10: Missouri River: The Missouri River is the longest river in North America. Rising in the Rocky Mountains of western Montana, the Missouri flows east and south for 2341 mi before entering the Mississippi River north of St. Louis, Missouri. The river takes drainage from a sparsely populated, semi-arid watershed of more than half a million square miles (1,300,000 km), which includes parts of ten U.S. states and two Canadian provinces. When combined with the lower Mississippi River, it forms the world's fourth longest river system.
Document 11: East Gallatin River: The East Gallatin River flows 42 mi in a northwesterly direction through the Gallatin valley, Gallatin County, Montana. Rising from the confluence of Rocky Creek and several other small streams, the East Gallatin begins about one mile (1.6 km) east of downtown Bozeman, Montana. The river joins the main stem of the Gallatin River 2.3 mi north of Manhattan, Montana. Throughout its course, the river traverses mostly valley floor ranch and farm land with typical summer flows of approximately 50 cuft/s
Document 12: Climate of Missouri: Missouri generally has a variety of seasonal humid subtropical climate (Köppen climate classification "Cfa"), with cool winters and long, hot summers. In the southern part of the state, particularly in the Bootheel, the climate borders on a more mild-type humid subtropical climate (Köppen "Cfa"), and in the northern third, the state transitions into a humid continental climate (Köppen "Dfa"). Because of its location in the interior United States, Missouri often experiences extremes in temperatures. Lacking either large mountains or oceans nearby to moderate its temperature, its climate is alternately influenced by air from the cold Arctic and the hot and humid Gulf of Mexico. St. Louis is surrounded by 2 rivers. The mississippi river and the Missouri river. With these 2 rivers surrounding St. Louis it can cause changes in the weather pattern.
Document 13: Mississippi River: 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 2320 mi 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.
Document 14: Yellowstone River: The Yellowstone River is a tributary of the Missouri River, approximately 692 mi long, in the western United States. Considered the principal tributary of the upper Missouri, the river and its tributaries drain a wide area stretching from the Rocky Mountains in the vicinity of the Yellowstone National Park across the mountains and high plains of southern Montana and northern Wyoming.
Document 15: Red Rock River (Montana): The Red Rock River is a roughly 70 mi river in southwestern Montana in the United States. Its drainage basin covers over 1548 mi2 . Its furthest tributary, Hell Roaring Creek, originates in the Beaverhead National Forest within a few hundred meters of the North American Continental Divide and Montana-Idaho border near Brower's Spring, at an elevation of about 9100 ft . Brower's Spring is near the furthest headwaters of the Missouri River, one of the major watercourses of the central United States. The drainage flows north and west with its name changing to "Red Rock Creek" into the Red Rock Lakes in the middle of a wide grassy valley; the Red Rock River issues from the west side of Lower Red Rock Lake. It flows west, receiving many tributaries such as Peet Creek and Long Creek, widening into the Lima Reservoir and then passing through a canyon, which ends near Lima, Montana. From there, it flows northwest through a valley, passing Kidd and Red Rock, and into Clark Canyon Reservoir. Under the waters of the lake was once the confluence of the Red Rock and Horse Prairie Creek, forming the Beaverhead River, a tributary of the Jefferson River, in turn a headwater of the Missouri River.
ground_truth: 2300 mi