That's when Marco and Dabees started to create this ongoing plan for using Sand Dollar Island, considered a spit, the lagoon and the surrounding mangroves to create a protective barrier.

A series of such hooks can develop over time. The spit creates an area of calmer water, sheltered by the spit. A lagoon, salt marsh and finally dry land can develop in this sheltered area.

This can be seen with the formation of a spit created when sand and other material ... the area behind the newly formed bar is known as a lagoon.