Question: Haxby Hall is located in the historic walled city at the confluence of which two English rivers?

Context paragraphs:
Old Town of Cáceres: Old Town of Cáceres is an historic walled city in Cáceres, Spain.

Delhi Gate, Delhi: Delhi Gate is the southern gate of many in the historic walled city of (Old) Delhi, or Shahjahanabad.  The gate links the New Delhi city with the old walled city of Delhi.  It stands in the middle of the road, at the end of Netaji Subhash Chandra Road (or Netaji Subhash Marg), at the edge of the Daryaganj.

Haxby Hall: Haxby Hall is an estate in York Road, village of Haxby, York, England.  It was built in 1790 on 22 acres (89,000 m²) of land.

San Agustin Church (Manila): San Agustin Church (Spanish: "Iglesia de la Inmaculada Concepción de María de San Agustín") is a Roman Catholic church under the auspices of The Order of St. Augustine, located inside the historic walled city of Intramuros in Manila.

Lohari Gate, Lahore: The Lohari Gate (Urdu: لوہاری گیٹ‎ ), frequently mispronounce as Lahori Gate, is located within Walled City of Lahore in Pakistan.  Lohari Gate is one of the 13 gates of the Walled City of Lahore.  Being one of the oldest gates of the old city, Lohari Gate is also known as Lohari gate.  According to some historians, the original (old) city of Lahore was originally located near Ichhra, and this gate opened towards that side.  The name also traces back its roots to the language of Urdu, in which, “Lohar” means Blacksmith.  This could also be another reason behind naming it this way.  However, there are no concrete evidences available that blacksmiths used to live or work here.

Shen-kuang-szu Incident: The Shen-kuang-szu Incident (Chinese: 神光寺事件; Pinyin: "Shénguāngsì Shìjiàn"; Foochow Romanized: "Sìng-guŏng-sê Sê̤u<nowiki>̤</nowiki>-giông") was a series of events that took place between 1850 and 1851 in Fuzhou, China and was marked as one of the earliest conflicts between local Chinese and foreign Protestant missionaries.  It began in June 1850 when two English missionaries rented rooms in a temple known as the Shen-kuang-szu on Wu-shih-shan within the walled city of Fuzhou.  In the months that followed, local Chinese gentry and officials attempted in various ways to evict the missionaries from the hill, but all their efforts apparently failed.  The controversy was settled the following year in October with the terms of the agreement stating that the missionaries were allowed to stay behind.  This led to great discontentment amongst the local gentry and eventually foreshadowed yet another more important missionary incident - the 1878 Wu-shih-shan Case.

Chhabra: Chhabra is a city and a municipality in Baran district in the state of Rajasthan, India, near to the border with Madhya Pradesh.  Chhabra is a historic walled city with a fort and got its name from the six gates in the walls.

Kavathe Yamai: Kavathe Yemai is a village located in Shirur Taluka in the Pune district of Maharashtra state.  In earlier times village was once located on the banks of the Ghod River (appx 5.8 km away from present location).  The village later moved to the current location when Maratha General Anand Rao I Pawar (of Dhar State) built a walled city (at current location).  The village boasts of the historical & cultural heritage.  The Palace built by Pawar dynasty in 18th century; various temples in Hemadpanthi architectural style are still in good condition.  This village was actually a walled city but with expansion of the village borders/habitation, the surrounding walls and its huge gates has crumbled down.

Kashmiri Gate, Delhi: The Kashmere Gate or Kashmiri Gate is a gate located in Delhi, it is the northern gate to the historic walled city of Delhi.  Built by the Mughal Emperor Shah Jahan, the gate is so named because it used to start a road that led to Kashmir.

York: York ( ) is a historic walled city at the confluence of the rivers Ouse and Foss in North Yorkshire, England.  The municipality is the traditional county town of the historic county of Yorkshire to which it gives its name.  The city has a rich heritage and has provided the backdrop to major political events in England throughout much of its two millennia of existence.  The city offers a wealth of historic attractions, of which York Minster is the most prominent, and a variety of cultural and sporting activities making it a popular tourist destination for millions.

Supporting paragraphs: Haxby Hall York
Answer: Ouse and Foss