According to AllTrails.com, the longest walking trail in Hackney is Finsburry and Hackney Wick Circular. This trail is estimated to be 11.7 mi long.
Hackney: With an ascent of 715 ft, Finsburry and Hackney Wick Circular has the most elevation gain of all of the walking trails in the area. The next highest ascent for walking trails is Finsbury Park Station to Trafalgar Square with 400 ft of elevation gain.