Reef 2D: rocky lagoon

Illustration of rocky reef base

Illustration of a 2D estuary with continental island and offshore reef

Illustration of patch reef base with coral cay and lagoon

Illustration of 2-dimensional coastline base of a closed estuary with nearshore reefs

Illustration of open lagoon base

As per Darwin's theory about the formation of coral atolls, this illustration shows the remaining coral atoll following subsidence of the original volcanic island.

Illustration of a 2D coastline with saltwedge

Illustration of lagoon base with barrier sand islands