Question: What city lies on the northern border of the city that administers Changfeng County?

Context paragraphs:
Avocado Heights, California: Avocado Heights is an unincorporated census-designated place in Los Angeles County, California, United States.  It lies in the San Gabriel Valley, near Puente Hills.  On the northern border lies the unincorporated community of West Puente Valley; on the eastern border the City of Industry.  A thin strip of the City of Industry runs to the south, and the Pomona Freeway and the Puente Hills are farther south.  To the west is the San Gabriel River and the San Gabriel River Freeway, as well as the California Country Club.  Avocado Heights is approximately 15 mi from the downtown Los Angeles Civic Center.  The population was 15,411 at the 2010 census, up from 15,148 at the 2000 census.

Hefei: Hefei ( , ), formerly known as Hofei, Luzhou, or Luchow, is the capital and largest city of Anhui Province in China.  A prefecture-level city, it is the political, economic, and cultural center of Anhui.  Located in the central portion of the province, it borders Huainan to the north, Chuzhou to the northeast, Wuhu to the southeast, Tongling to the south, Anqing to the southwest and Lu'an to the west.

Thornton Township High School District 205: Thornton Township High School District 205 is a consolidated high school district based in Harvey, Cook County, Illinois that serves much of Cook County's Thornton Township.  The district is located due south of the city of Chicago; the township's northern border matches up with the southern border of the city proper.  District 205 is composed of three high schools, all located in different villages throughout Thornton Township.  Thornton Township High School is located in the western reaches of Thornton Township in the village of Harvey, and is led by principal Tony Ratliff.  Another high school in the district is Thornridge High School in Dolton, a village located at the northern border of the township.  The principal of Thornridge High School is Ebonie Williams.  the third district school is Thornwood High School, which is located in the township seat of South Holland; Thornwood's principal is Dennis Willis.  The district superintendent is Leotis Swopes.

Zona Sur: The Zona Sur ("Southern Zone") is one of the five natural regions on which CORFO divided continental Chile in 1950.  Its northern border is formed by the Bío-Bío River, the limit with the Central Chile Zone.  By west with the Pacific Ocean, by the east with the Andean mountains and Argentina.  Its southern border is the Chacao Channel, beyond it lies the Austral Zone.  While Chiloé Archipelago belongs geographically to Zona Austral in terms of culture and history it lies closer to Zona Sur.

Rancho Jimeno: Rancho Jimeno was a 48854 acre Mexican land grant in present day Colusa County and Yolo County, California given in 1844 by Governor Manuel Micheltorena to Manuel Jimeno Casarin.  The grant extended along the west bank of the Sacramento River from near the northern border of Colusa County south to just over the northern border of Yolo County.

San Gabriel Mountains: The San Gabriel Mountains are a mountain range located in northern Los Angeles County and western San Bernardino County, California, United States.  The mountain range is part of the Transverse Ranges and lies between the Los Angeles Basin and the Mojave Desert, with Interstate 5 to the west and Interstate 15 to the east.  This range lies in, and is surrounded by, the Angeles National Forest, with the San Andreas Fault as the northern border of the range.

James City, Pennsylvania: James City is an unincorporated community and census-designated place in Elk County, Pennsylvania, United States.  It lies approximately 4 mi south of Kane, about 1 mi away from Pennsylvania Route 66.  It is in the northern part of Highland Township, and its northern border is the McKean County line.  As of the 2010 census the CDP population was 287.

Big Black River (Mississippi): Big Black River is a river in the U.S. state of Mississippi and a tributary of the Mississippi River.  Its origin ( ) is in Webster County near the town of Eupora in the north central part of the state.  From there it flows 330 mi in a generally southwest direction until it merges with the Mississippi River 25 mi south of the city of Vicksburg.  It is the major contributor to the Big Black River Basin.  It forms part of the northern border of Choctaw County, passes through Montgomery County, and forms the eastern border of Holmes County and the northern border of Claiborne County.

Shelltown, San Diego: Shelltown is a neighborhood located within Southeast San Diego, approximately 5 minutes from downtown San Diego by car and 25 minutes by bicycle.  It is bordered by National City on the south, Interstate 5 and Barrio Logan on the west, 43rd Avenue (a continuation of Highland Avenue) on the east, and Gamma Court and the neighborhood of Southcrest on the north.  Prior to the 1980s the northern border of Shelltown was National Ave and many residents still consider that the northern border.

Changfeng County: Changfeng County () is a county in Anhui Province, People's Republic of China, under the administration of Hefei city.  The county has a surface of 1,922.24 km² and a population of 629,535 inhabitants.  It contains 9 towns, 6 townships, and a development zone.

Supporting paragraphs: Changfeng County Hefei
Answer: Huainan