- mountain forms
- mountain glacier
- mountain mire, upland mire
- mountain peak
- mountain range, mountain chain
- mountain sickness
- mountain spur
- mountain-valley breeze
- mountains
- mudflow
- multi-cropping index
- multi-dimensional analysis
- multi-spectral remote sensing
- multicomponent map
- multiple land use
- multiple nuclei theory
- multispectral scanner, MSS
- national atlas
- national park
- natural calendar
- natural complex
- natural environment
- natural epidemic focus
- natural hazard
- natural landscape
- natural levee
- natural potential productivity
- natural resources
- nature reserve
- negative landform
- neighbourhood
- Neoarctic
- neoglaciation
- neotectonic movement
- Neotropic
- neutral zone
- niche, microhabitat
- nival belt
- nivation
- nodal point
- nodal region
- non-basic activity
- nonrenewable resources
- noosphere
- normal landform
- North Pole
- northern hemisphere
- oasis
- oasis cultivation
- ocean