Marsden Cove Marina sits just inside the entrance to Whangarei Harbour on the southern side, roughly 7 km from Whangarei Heads, within a canal housing development in Northland, New Zealand.

Whangarei Harbour is the largest in Northland, stretching approximately 45 km long and up to 6. 5 km wide. The marina offers 236 berths with complete tidal access, a fuel dock, customs services, waterfront retail, and a boat haul-out and hardstand facility.

It is also home to one of the country's top free public boat ramps, featuring three concrete ramps. The access channel and marina basin both reach 3 metres depth at low tide. A strict 3-knot no-wake policy applies throughout the marina area.