Dozens of humpbacks churn up the water in a feeding frenzy on the NSW Far South Coast

More than 100 feeding adult humpbacks have put on a show - and what a sight to behold ...

"It was absolutely insane. It was like sensory overload because you could actually hear and smell them," photographer David Rogers said.

While their annual migration attracts visitors all along the NSW Far South Coast, this activity in water near Haycock Point in Ben Boyd National Park was unprecedented, Mr Rogers said.

Merimbula Marina owner Jessica Miller watched the weekend's feeding event, and said a whale-watcher had tolder her it was the biggest number of whales he'd seen working together in his 24 years of whale-spotting.

"It was an amazing natural wonder. It was amazing to see that number of whales feeding," she said. "Once you have an encounter you realise they are amazing animals.

"People have a real connection with them."