Caroni Swamp (KA-ro-nee), swamp, Trinidad, Trinidad and Tobago, SSE of Port of Spain, 10 mi/16 km E of Caroni, 5 mi/8 km bordering Gulf of Paria, W coast. Low area stretching from San Juan in the N to Waterloo in the S. Extensive mangrove forests, nesting place of white ibis and scarlet ibis, the natl. bird. Experiencing effects of development.