Question: Which canal, the Conewago Canal or the Orleans Canal is longer ?
Context: Obvodny Canal (Russian: Обводный канал , lit.  Bypass Canal) is the longest canal in Saint Petersburg, Russia, which in the 19th century served as the southern limit of the city.  It is 8 km long and flows from the Neva River near Alexander Nevsky Lavra to the Yekaterinhofka not far from the sea port.  The canal was dug in 1769–80 and 1805–33.  By the late 19th century, after to the Industrial Revolution, it had effectively become a sewer collecting wastewater of adjacent industrial enterprises.  Eventually the canal became shallow and no longer navigable.  The banks of the canal are lined with granite. The Conoy Canal Trail is a section of the planned Northwest Lancaster County River Trail, that runs for 3.75 miles along the Conewago Canal which stretches from Bainbridge to Falmouth.  The canal was opened in 1797.  As a trail, it has been opened to hikers, bikers, fisherman, and runners for more than a decade. The Canal Streetcar line is a historic streetcar line in New Orleans, Louisiana.  It is operated by the New Orleans Regional Transit Authority (RTA).  It originally operated from 1861 to 1964.  It was redesigned and rebuilt between 2000 and 2004, and operation was reinstated in 2004 after a 40-year hiatus.  Primarily running along its namesake street, Canal Street, it consists of two branches named for their outer terminals, totaling about 5+1/2 mi in length: "Canal - Cemeteries" (officially designated as Route 47) and "Canal - City Park/Museum" (officially designated as Route 48).  Each branch is denoted with the red and light green colors respectively on most RTA publications. The Conewago Canal, on the west bank of the Susquehanna River below York Haven, Pennsylvania, 11 mi south of Harrisburg in York County, enabled late 18th and early 19th century rivercraft to safely bypass rapids at Conewago Falls.  Work on the canal of less than 1 mi began in 1793 and was completed in 1797.  Robert Morris, a Philadelphia financier, organized the project, which was carried out by chief engineer James Brindley, the nephew of a well-known British engineer of the same name.  Two lift locks overcame 19 ft of elevation between the ends of the canal, and a guard lock blocked unwanted water, particularly during floods.  Cargo could go upstream as well as down.  A boat going upriver could navigate the canal in 37 minutes compared to the whole day it would take 30 or 40 men to pull it upriver along the bank.  York Haven is at . The London Avenue Canal is a drainage canal in New Orleans, Louisiana, used for pumping rain water into Lake Pontchartrain.  The Canal runs through the 7th Ward of New Orleans from the Gentilly area to the Lakefront.  It is one of the three main drainage canals responsible for draining rainwater from the main basin of the city of New Orleans.  The London Avenue Canal's flood walls built atop earthen levees breached on both sides during Hurricane Katrina in 2005. One Canal Place, located at 365 Canal Street in the Central Business District of New Orleans, Louisiana, is a 32-story, 440 ft -tall skyscraper.  The building contains The Shops at Canal Place and is attached to the Westin New Orleans Canal Place hotel, with which it shares a parking garage. The 17th Street Canal is the largest and most important drainage canal in the city of New Orleans.  Operating with Pump Station 6, It moves water into Lake Pontchartrain.  The canal, along with the Orleans Canal and the London Avenue Canal, form the New Orleans Outfall Canals.  The 17th Street Canal forms a significant portion of the boundary between the city of New Orleans and Metairie, Louisiana.  The canal has also been known as the Metairie Outlet Canal and the Upperline Canal. The New Canal Light or (more commonly New Canal Lighthouse or New Basin Canal Lighthouse) was first established in 1838 at the north end of the New Basin Canal which ran from Lake Pontchartrain to the Uptown or "American" section of the city which today is known as the New Orleans Central Business District.  The canal was filled in about 1950, but the lighthouse remained on a jetty extending into the lake on a half mile long stretch of the canal that was left and is still used as a small boat and yachting harbor. The Orleans Canal is a drainage canal in New Orleans, Louisiana.  The canal, along with the 17th Street Canal and the London Avenue Canal, form the New Orleans Outfall Canals.  The current version of the canal is about 2 km long, running along the up-river side of City Park, through the Lakeview and Lakeshore neighborhood, and into Lake Pontchartrain.  It is part of the system used to pump rain water out of the streets of the city into the Lake.  The Canal has also been known as the Orleans Avenue Canal, the Orleans Outfall Canal, the Orleans Tail Race, and early on, the Girod Canal, The New Basin Canal, also known as the New Canal and the New Orleans Canal, was a shipping canal in New Orleans, Louisiana, from the 1830s through the 1940s.
Answer: The Orleans Canal