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Islands:All land mass larger than 9,000 m2 within the territorial waters of Trinidad and Tobago were digitized. Image errors: In a few locations there are obvious image mosaic errors where the two neighbouring image tiles do line up. It was decided to not digitize the error but rather to estimate where the coastline would be using the neighbouring tiles as a guide. Sargassum:Several beaches, esp. along the eastern region of Tobago, had significant build-up of Sargassum seaweed which concealed the high water mark. In those instances, the upper boundary of the Sargassum was used as the demarcation for the high water mark. 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