When a tract or contiguous tracts of land, aggregating twenty or more acres in area, are embraced within the municipal limits of any city, which are upon or contiguous to the border thereof, the owners of said tracts of land may petition the district court for the county in which such land, or any part thereof, is situated to have the same disconnected from said city.
C.R.S. § 31-12-601
This section is similar to former § 31-8-401 as it existed prior to 1975.