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Chain (US Survey)

The US survey chain is a unit of length used historically in land surveying in the United States. It is defined as exactly 66 US survey feet, which is slightly longer than the international foot. Since one US survey foot equals about 0.3048006096 meters, the US survey chain is approximately 20.11684 meters long.

Like the standard chain, it is divided into 100 links, each measuring 0.66 US survey feet. The US survey chain was widely used in the Public Land Survey System to measure land parcels and boundaries.

Key facts:

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  1 US survey chain = 66 US survey feet

  
  
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  1 US survey chain ≈ 20.11684 meters

  
  
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  10 US survey chains = 1 furlong

  
  
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  80 US survey chains = 1 US survey mile

  
  

Though the US survey foot and chain are being phased out in favor of international units, the US survey chain still appears in historical land records and some legal contexts.

Arpent

An arpent is a traditional unit of length and area used primarily in French-speaking regions, especially in parts of Canada (like Quebec) and Louisiana in the United States. It originated in France and was commonly used in land measurement and agriculture.

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  As a length, one arpent is approximately 192 feet (about 58.47 meters), though it varies regionally.

  
  
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  As an area, an arpent is roughly equal to 0.84 acres or about 3,400 square meters.

  
  

The arpent was important for defining land parcels during French colonial times and is still referenced in legal land descriptions in some areas today.

Summary:

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  Length: ~192 feet (58.47 meters)

  
  
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  Area: ~0.84 acres (3,400 m²)

  
  
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  Used historically in French-influenced regions for land measurement

  
  
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  Still appears in land records and legal contexts in parts of North America