The search is on across social media for a woman and two children featured in hundreds of holiday photos discovered on a memory card found by the beach on North Stradbroke Island off south-east Queensland.

It was discovered on Monday by Sonja Elliot's eight-year-old son Zakai, who spotted it on the Gorge Walk at Point Lookout.

"We'd been watching the whales for about half-an-hour — as we were leaving he found the memory card," Ms Elliot said.

"We looked around and there was no-one else there.

"We weren't sure what to do, whether to leave it or not. We decided to take it and give it to the fish and chip shop across the road … but we were running late for the ferry and we forgot it was in our pocket, so we took it home with us."

Ms Elliot had a look at the photos on Wednesday, sharing a couple online in the hope the woman and two children featured throughout would be identified so they can could be reunited with their holiday memories.

She said looking at the photos it appeared the family were holidaying in Australia from Germany.

"I think the daughter's graduated from high school there because she's holding a certificate — that's where the photos start," Ms Elliot said.

"On closer inspection it seems they started their time in Australia in Sydney and have been travelling up the coast to Brisbane."

Ms Elliot said one photo showed the woman and two children at Booti Booti National Park, about 282 kilometres north-north-west of Sydney.

"There are not many shots of the woman, and lots of nature photos," she said.

"The last photo is a beach, but it's not Straddie … so obviously they've changed memory cards and dropped this one."

Ms Elliot's already reached out to some prominent North Stradbroke Island businesses hoping they would help by sharing the photos.

"I put it on some Stradbroke Facebook sites … and I've contacted a few other pages.

"I've also contacted a group called Germans in Australia, because I thought perhaps they'd have family but I haven't heard back from them."