Beaches Reclaim Their Sand

The morning tide at Playa Negra, in the northern reaches of Puerto Azul's harbour district, leaves behind a ribbon of tan-coloured foam and fragments of net that smell of diesel and decay. Rosa Martínez, the site coordinator for the Coastal Restoration Collective, walks the line with a clipboard and a pair of tongs, counting the pieces. By mid-morning, three volunteers and two paid crew members have filled four bags with microplastics alone.

Across Costa Mar's 180 kilometres of monitored coastline, the cleanup effort has become routine—but only recently. Between 1 October and today, the Costa Mar Reef Monitoring Network recorded 47.3 tonnes of plastic waste and nutrient-laden sediment removed from twelve major beaches and three estuary mouths. The figure represents a marked acceleration from the dry-season average of 6 to 8 tonnes per month.

The surge reflects both a problem and a response. Runoff from the interior valleys intensifies as the rainy season peaks, carrying fertiliser residue and erosion into the coastal zone. At the same time, a federal grant approved in August has funded three additional cleanup crews and extended the monitoring schedule to six days a week. What emerges is a portrait of a region locked in seasonal rhythm with the land and sea—and the growing machinery required to keep them in balance.