Humboldt meridian, Principal meridian in Northern California, US.
The Humboldt Meridian is a reference line running through Northern California at longitude -124.120589 that serves as the main baseline for land surveys in the region. This line works together with latitude lines to form the survey grid that defines parcels and marks boundaries.
The meridian was established in 1853 as part of the system for surveying and dividing federal public lands during America's westward expansion. It helped surveyors map vast territories in an organized way and settle land claims.
This reference line shaped how people organized and settled the land across Northern California, and you can still see its influence in property boundaries and community layouts today. The way farms and towns developed follows patterns that trace back to this survey system.
To see or understand this line, you can find historical survey markers and boundary stones scattered across the landscape, often placed at intersections or key survey points. Anyone interested in survey history can find more information at local government offices and county surveyor archives.
This line is not visible as a physical structure but exists as an invisible network in survey records and property boundaries based upon it. Many people cross this line daily without realizing they are crossing one of the most fundamental references for American land management.
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