Deductions
- continent is subclass of natural geographic object ⇐ (ocean is subclass of natural geographic object), (ocean is opposite of continent)
- natural geographic object is subclass of artificial geographic entity ⇐ (artificial geographic object is subclass of artificial geographic entity), (artificial geographic object is opposite of natural geographic object)
- artificial geographic object is opposite of natural geographic object ⇐ natural geographic object is opposite of artificial geographic object
- natural geographic object is subclass of geographic entity ⇐ (natural geographic object is subclass of geographical feature), (geographical feature is subclass of geographic entity), (is subclass of is a transitive relation)
- prison island is subclass of natural geographic object ⇐ (prison island is subclass of island), (island is subclass of natural geographic object), (is subclass of is a transitive relation)
- island is subclass of natural geographic object ⇐ (island is subclass of landform), (landform is subclass of natural geographic object), (is subclass of is a transitive relation)
- landform is subclass of natural geographic object ⇐ (landform is subclass of geomorphological unit), (geomorphological unit is subclass of natural geographic object), (is subclass of is a transitive relation)