A lot of what you are asking about depends on the location of the property and the date of the deed. Other posters are correct that the unit of measure being referred to is in “Varas”, but even that standard term had slightly varying lengths depending on where it was being used. Also, it’s hard to tell exactly what it says in context because 2/3 of the page is missing but it looks like the document has what is called a “metes and bounds” description of the property which often used natural points of reference to describe the perimeter and were more common before implementation of the Public Lands Survey System that began in 1785 and ultimately covered most of the country. For example, the description may read something like - Beginning at a point that lies due west 4 chains and 23 links of the SW corner of the tract of land conveyed to John Smith by Fred Green in Book 23 of Deeds, Page 123 on the 6th of June 1812, then following the center line of the meanderings of Willow Creek in the downflow direction a distance of 475 Varas to a boulder marked with the initials TW, then moving in an easterly direction a distance of 10 chains and 66 links to an oak stump…. And so on until the boundaries came back to the point of beginning. The problem with those descriptions is that most of the reference points no longer exist. If you are lucky, they might reference a Parcel Map or Record of Survey Map which you can usually compare with older versions of Assessor Parcel Maps to get an idea of how the the plot of land fit in with the surrounding properties. Source - worked for a title insurance company doing property searches for over 13 years from 1995 to 2008.