All places in the Places API are categorized into one out of 9 feature classes (represented by letters) and further subcategorized into one out of 684 feature codes.
Feature Codes
| U: Undersea | ||
| Code | Short Description | Full Description |
|---|---|---|
| HLLU | Hill | An elevation rising generally less than 500 meters |
| HLSU | Hills | Elevations rising generally less than 500 meters |
| HOLU | Hole | A small depression of the sea floor |
| KNLU | Knoll | An elevation rising generally more than 500 meters and less than 1,000 meters and of limited extent across the summit |
| KNSU | Knolls | Elevations rising generally more than 500 meters and less than 1,000 meters and of limited extent across the summits |
| LDGU | Ledge | A rocky projection or outcrop, commonly linear and near shore |
| LEVU | Levee | An embankment bordering a canyon, valley, or seachannel |
| MESU | Mesa | An isolated, extensive, flat-topped elevation on the shelf, with relatively steep sides |
| MNDU | Mound | A low, isolated, rounded hill |
| MOTU | Moat | An annular depression that may not be continuous, located at the base of many seamounts, islands, and other isolated elevations |