Survey Markers and Benchmarks
Benchmarks are a type of survey markers whose elevations have been surveyed as accurately as possible based on the technology at the time.
Atmospheric Rivers
Atmospheric Rivers are trails of moisture in the atmosphere composed of condensed water vapor.
Isthmus
An isthmus is a narrow strip of land connecting two larger land masses which is bounded by water on two sides.
Geography Terms Visualized
This chart by the Bancroft Company from around 1870 defines a range of geographical terms.