Definition: A base line is the east-west reference line paired with a principal meridian in the rectangular survey system.
Example
Township 2 North is located north of the governing base line.
Keep the distinction clear
Township designations measure north or south from the base line; range designations measure east or west from the principal meridian.
Related terms
Principal Meridian · Township Lines · Government Survey System
Keep studying
Government Survey: Township, Range, Sections, and Acreage
References: BLM: surveying and mapping glossary
Pronunciation (US): BAYS LYN (capitals show stress)
Pronunciation reference: Merriam-Webster
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