The Harbord Harlequins is in the Manly District, along with Manly Roos, Seaforth Pirates, Allembie Jets and Forest Rugby.
The Vikings is a Joint Venture between 2 or more of these clubs and occurs in years where an individual club is unable field a full team or the range of players is such that combining clubs achieves a better outcome for the players. This typically happens at U14s or older when players sometimes leave club rugby to play for their school. Players remain a member of their home club. The participating clubs share responsibilities when it comes to coaching, managing and ground allocations.