The foreshore clean-up, which removed trailer loads of rubbish, was organised by the Hawke's Bay Regional Council with the help of the Environment Centre, which handled recyclable waste.
It was one of 28 Seaweek events in Hawke's Bay.
Hawke's Bay Seaweek Co-ordinator Jake Brookie said Seaweek, organised by the New Zealand Association of Environmental Education, was an educational programme because "it is really hard to care for something that you don't understand".
"Here at the Waitangi Regional Park, the estuary here helps purify the water running in from the rivers like the Tutaekuri River and Ngaruroro River," he said.
"It purifies this water which minimises damaging algal blooms out at sea, which could wreak havoc on the marine ecosystem."
He said New Zealanders were intrinsically connected to the sea.
"No part of New Zealand is more than 130km away from the sea. We have 17,000km of coastline. The ocean also gives so much back to us."
Made with funding from