Town Quay Marina sits on the eastern shores of Southampton Water, within the Port of Southampton, offering direct access to the Solent's cruising and racing waters.

Approaching from seaward, the marina lies to starboard past the docks and control tower on the River Test; entry is via a dogleg between two floating wave breaks. Mariners should be alert to the Red Jet high-speed ferry, which berths at the adjacent jetty.

The marina holds around 126–130 berths and is accessible at all states of the tide over a soft mud bottom. A dedicated visitors' pontoon is available, and berthing assistance can be reached on VHF Ch 80.

Its city-centre location puts it within walking distance of Southampton's shopping, restaurants, and cultural venues, while historic Portsmouth, the Isle of Wight, and the Beaulieu River are all within easy cruising distance.