Boat Harbour at Gerringong is a small natural harbour on the town's rocky northern shore, with a boat ramp and a 40 m ocean rock pool tucked around the corner from the car park. It is primarily a swimming and family snorkelling venue rather than a scuba site, but it is included here because it is one of the named snorkel spots on this stretch of coast and a gentle introduction to the local reef life.

The pool is roughly 40 m long with about 30 m of swimmable length and is deepest at its eastern end. Its rocky floor supports patches of seaweed where snorkellers find flathead, sea stars, sea slugs and small schools of fish, and at low tide the flat rocks and small tidal pools around it can be explored on foot. On flat days the rocks outside the pool offer more of the same, with luderick, bream and occasional blue groper typical of the Kiama coast.

Facilities are good: accessible toilets, cold showers, a gas barbecue with a gazebo and picnic tables, and free parking. There are no lifeguards and dogs are not permitted. For scuba divers the site is of limited interest beyond a shallow gear check, but for families, snorkellers and those staying in Gerringong it is a safe, pretty spot. Keep well clear of the boat ramp, which is used by fishing boats, and never snorkel outside the pool in any swell. It pairs well with the Werri Point platform at the other end of Werri Beach for a family day of rock-pool exploration.

From the Princes Highway take the Gerringong exit and follow the signs through the village to Jupiter Street and the Boat Harbour car park (free; most spaces are up the hill). The ocean pool is about 150 m from the car park along an easy path around the corner from the boat ramp. Enter the pool via a rocky ramp at the shallow western end, or use the boat ramp for snorkels outside the pool in calm conditions.

The pool is sheltered but large easterly or south-easterly swell washes over its walls and stirs the bottom. Outside the pool, snorkelling is only sensible in flat conditions. Water temperature is typically around 19–21 °C in summer.

Visibility drops after rain and swell. North-easterly sea breezes on summer afternoons add chop outside the harbour, so mornings are best, and the pool can be dirty for a few days after a big blow when weed washes in.

Snorkel the rocky floor and weed patches of the pool, then on calm days explore the rocks just outside, staying clear of the boat ramp.

No operator; a family snorkelling and swimming venue. The boat ramp is used by local fishers and occasional private dive boats.