Good evening and thanks for submitting this interesting question. If you have actually exercised control over this land for 22 years, it's possible that you can claim ownership by way of adverse possession. Here is an excerpt from a South Dakota Court case which explains adverse possession.
Those claiming ownership to land through adverse possession must show that their possession was “actual, open, visible, notorious, continuous, and hostile” for over twenty years. Taylor v. Tripp, 330 NW2d 542, 544 (SD 1983). Under SDCL 15-3-13, adverse possession can be established only if it “has been protected by a substantial enclosure or [if] it has been usually cultivated or improved.” This statute thus provides a prerequisite to a justiciable adverse possession claim. Failure to show either a substantial enclosure or usual cultivation or improvement preempts the claim. Furthermore, adverse possession must be shown by clear and convincing evidence. Cuka v. Jamesville Hutterian Mut. Soc., 294 NW2d 419, 422 (SD 1980).
This is a very technical type of case and requires a lawyer who is familiar with those legal principles. When the claim is made it's very likely that the owner, who didn't even know he own the property will negotiate a voluntary sale to you, rather than go to the expense of defending a quiet title suit.
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