The following 30 keywords have been used to index the images contained in the database:

Reef
Fringing reef
Reef flat
Reef crest
Patch reef
Barrier reef
Lagoon
Channel

Cliff
Coastal terrace
Harbor
Marina
Islet
Island
Point
Peninsula
River
Bay
Cove
Beach
Collapse

Igneous coastline
Limestone coastline
Rocky coastline
Sandy coastline
Artificial coastline

Inland
Inland northern Guam
Inland southern Guam
Badlands

The keywords above are in addition to any place names also assigned to individual images.