Erosion and accretion are active, changing the island's outline over time. Corals have colonized the substrate in the shallow waters surrounding the island. The reef extends approximately 300 m offshore in the south and is widest in the north where it extends approximately 1.2 kilometers offshore. The accumulation of non-mineral organic materials that act as ephemeral constituents of the beach may have a marked effect on beach processes and morphology. These debris serve as traps which inhibit the transport of sand and cause the temporary storage of sand and stability of the beach environment.
Beach erosion occur in areas adjacent to the beach.
The composition of beach sediments is derived from the available material in nearby areas and reflects the nature of material brought in from the nearshore or alongshore sources. Transport of sand in the surf and intertidal zone accounts for a significant volume of immediate sand supply. Erosion of the coast itself, reworking and shoreward movement of beach and nearshore material are also important sources of sand. The source of the coralline beach sand is the surrounding fringing reefs. Areas of reef development generally provide locally derived beach materials which include various biogenic carbonate grains that reflect the composition of living biota adjacent to the beach.