Question: What is the name of the Valley in which the Lenni-Lenape Nation were living at the time when Philadelphia was established and through which the Delaware River flows?

Context paragraphs:
Tamanend: Tamanend or Tammany or Tammamend, the ""affable"", (c. 1625–c. 1701) was a chief of one of the clans that made up the Lenni-Lenape nation in the Delaware Valley at the time Philadelphia was established.  Tamanend is best known as a lover of peace and friendship who played a prominent role in developing amicable relations among the Lenape and the English settlers who settled Pennsylvania, led by William Penn.

Cohoquinoque Creek: The Cohoquinoque Creek was formerly a stream running west to east through the Callowhill neighborhood in Philadelphia, along the southern part of Northern Liberties and immediately north of original northern boundary of Philadelphia.  This small tributary of the Delaware River remains today, as a sewer, under Willow Street, which winds its way through what is sometimes called the East Callowhill Industrial District.  Its name, spelled various ways (Cohoquenoque, Cohoquonoque, Cohoquinoke), is said to be derived from a Lenni-Lenape word for "the grove of long pine trees."  This was also the name of a nearby Lenape village.

Frankford Creek: Frankford Creek is a minor tributary of the Delaware River in southeast Pennsylvania.  It derived its name from the nearby town of Frankford, Philadelphia County.  The stream originates as Tookany Creek at Hill Crest in Cheltenham Township and meanders eastward, then southeastward, throughout Cheltenham Township, until a sharp bend near the Philadelphia border at Lawncrest, where the place names Toxony and Tookany were used in historic times; the stream is still known as Tookany Creek in this region, where it flows southwest.  Turning south into Philadelphia at the crotch of Philadelphia's Y-shaped border, the creek is called Tacony Creek; from here southward, it is considered the informal boundary separating Northeast Philadelphia from the rest of the city.  The Philadelphia neighborhoods of Olney and Feltonville lie on the western side of the stream in this area while Northwood, Lawncrest, Summerdale, and Frankford lie on the eastern side.  It continues to be called the Tacony at least until the smaller Wingohocking Creek merges with it in Juniata Park, within the city-owned golf course.  Beyond Castor Avenue it is known as Frankford Creek until the stream's confluence with the Delaware River in the Bridesburg neighborhood of Philadelphia, Pennsylvania.  The section of stream known as Frankford Creek is 3.1 mi long, and the upstream section known as Tacony Creek, from Hill Crest, is 11.1 mi long.

Shellpot Creek: Shellpot Creek is a tributary of the Delaware River in northeast New Castle County, Delaware.  The stream rises between Grubb Road and Shipley Road, south of Naaman's Road at in Brandywine Hundred and flows southeast for about six miles before discharging into the Delaware River at near Edgemoor.  Prior to 1938, the stream drained into the Brandywine Creek, but was subsequently redirected to the Delaware River.

Delaware Valley: The Delaware Valley is the valley through which the Delaware River flows.  By extension, this toponym is commonly used to refer to Greater Philadelphia or Philadelphia metropolitan area ("the [Lower] Delaware Valley Metropolitan Area"), which straddles the Lower Delaware River just north of its estuary.  The Delaware Valley Metropolitan Area is located at the southern part of the Northeast megalopolis and as such, the Delaware Valley can be described as either a metropolitan statistical area (MSA), or as a broader combined statistical area (CSA).  The Delaware Valley Metropolitan Area is composed of several counties in southeastern Pennsylvania and southwestern New Jersey, one county in northern Delaware and one county in northeastern Maryland.  The MSA has a population of over 6 million, while the CSA has a population of over 7.1 million (as of the 2010 Census Bureau count).  Philadelphia, being the region's major commercial, cultural, and industrial center, wields a rather large sphere of influence that affects the counties that immediately surround it.

Interstate 95 in Pennsylvania: Interstate 95 (I-95) is an Interstate highway running from Miami, Florida, north to Houlton, Maine.  In the U.S. state of Pennsylvania, the route is known by many as the Delaware Expressway, but is officially named The Vietnam Veterans Memorial Highway.  and locally known as "95".  It runs 51 mi from the Delaware state line near Marcus Hook to the New Jersey state line crossing the Delaware River near Yardley on the Scudder Falls Bridge.  It parallels its namesake Delaware River for its entire route through the city of Philadelphia and its suburbs.  It is a major route through the city and the metropolitan Delaware Valley, providing access to locally important landmarks such as Philadelphia International Airport, the Philadelphia Sports Complex, Talen Energy Stadium, Penn's Landing, and Philadelphia Mills.  Of the 15 states that Interstate 95 runs through, Pennsylvania is the only one that does not border the Atlantic Ocean.

Belvidere Delaware Railroad: The Belvidere Delaware Railroad (Bel Del, 1851–1871) was a railroad running along the eastern shore of the Delaware River from Trenton, New Jersey north via Phillipsburg, New Jersey to the small village of Manunka Chunk, New Jersey.  It became an important feeder line for the Lehigh Valley Railroad's join to the Central Railroad of New Jersey, which was constructed into Phillipsburg, NJ at about the same time.  This connected Philadelphia and Trenton, NJ at one end of the shortline railroad to the rapidly growing lower Wyoming Valley region, and via the Morris Canal or the CNJ, a slow or fast connection to New York City ferries crossing New York Harbor from Jersey City, NJ.  In 1871 the CNJ leased various railroads in Pennsylvania, most from the Lehigh Coal & Navigation Company allowing the CNJ to penetrate to the upper Wyoming Valley, over some stretches, competing directly with the Lehigh Valley Railroad and with the Lehigh Canal and the trunk road connection of the Belvidere Delaware Railroad to New York became less profitable since Philadelphia connected more easily to Northeastern Pennsylvania thereafter without needing a double-crossing of the Delaware River; a general revenue decline ensued, leading to the Pennsylvania Railroad acquiring the rights, where it served as part of the Pennsylvania Railroad (PRR) system, carrying mainly anthracite coal and iron ore from northeastern Pennsylvania to population centers along the coast.

Delaware River: The Delaware River is a major river on the Atlantic coast of the United States.  It drains an area of 14119 sqmi in five U.S. states—New York, New Jersey, Pennsylvania, Maryland and Delaware.  Rising in two branches in New York state's Catskill Mountains, the river flows 419 mi into Delaware Bay where its waters enter the Atlantic Ocean near Cape May in New Jersey and Cape Henlopen in Delaware.  Not including Delaware Bay, the river's length including its two branches is 388 mi .

Little Delaware River: Little Delaware River flows into the West Branch Delaware River by Delhi, New York.

Christina River: The Christina River is a tributary of the Delaware River, approximately 35 miles (56 km) long, in northern Delaware in the United States, also flowing through small areas of southeastern Pennsylvania and northeastern Maryland.  Near its mouth the river flows past downtown Wilmington, Delaware, forming the city's harbor for traffic on the Delaware River.  The Port of Wilmington, opened in 1923 at the river's mouth, handles international cargo and trade.

Supporting paragraphs: Tamanend Delaware Valley
Answer: Delaware Valley