Here's a more complete list of land measurement terms. cstreet 1 perch is a linear measure of one rod, 160 perches as a linear measure is 1/2 mile. As a measure of area, a perch is one square rod of land; 160 perches is one acre. 1 rod is a linear measure is 5 1/2 yards or 16 1/2 feet; as a unit of measure a rod equals 30.25 square yards. Here's more. 40 rods is one furlong 40 square rods is 4 square roods 4 square roods is 1 acre 1 mile is 80 chains or 320 rods or 5280 feet 1 chain is 4 rods or 66 feet or 100 links 1 square chain is 16 square poles 1 square pole is 625 square links 1 link is .66 feet or 7.92 inches 25 links is one rod 100 links is a surveyors chain 1 square pole is 625 square links. 1 acre is 43560 square ft or 10 square chains or 160 square rods or 4840 square yards. 8 furlongs is one mile 1760 yards is one mile 80 chains is one mile. 640 acres is 1 square mile. 1 square mile is 1 section or 640 acres 1 Congressional township is 6 miles square or 36 sections or 36 square miles 1 Civil township is political subdivision and may be square or irregular in shape. The acreage is indefinite. Metes and bounds describe land that was never a part of public domain: the 13 original states, Maine, Vermont, West Virginia, Kentucky, Tennessee and Texas. At one time a tract was 24 square miles. Today it generally refers to a piece of land. ---------- Keith/Connie Street ckcasey@netins.net 325 Franklin Ave, Wapello, IA 52653-1515 319-523-8164 --.