is a specific kind of: object, physical object.

is a broader term that covers: aquifer | beach | cave | cliff, drop, drop-off | delta | diapir | folium | foreshore | ice mass | lakefront | massif | monocline | mouth | depression, natural depression | elevation, natural elevation | oceanfront | chain, chain of mountains, mountain chain, mountain range, range, range of mountains | relict | ridge, ridgeline | ridge | shore | incline, side, slope | fountain, natural spring, outflow, outpouring, spring | scree, talus | mineral vein, vein | crater, volcanic crater | wall | groundwater level, water level, water table ... show more.

instances of which are: Pillars of Hercules.

domain category: geology.