The document discusses erosion at Columbus Bay in Trinidad located between Los Gallos and Coral Point. It notes that historical sketches and photos show there used to be more rock stacks in the bay, evidence that erosion has reduced them over time. Groynes have been constructed to trap sediment and prevent further shoreline erosion. Photos depict the remaining rock stacks, a now-collapsed natural arch, and active erosion along the coast at Coral Point where the road is disappearing into the sea.