Re: Unregisteres plot of land
1. Fence it off.
2.Make very obvious claims of ownership, plant some trees, graze some cows........
3. Wait 12 years.
Only problem is if this is unregistered land, you will find it hard to ever sell it as there is no title to it.
So, if land is not registered, see what Valuation Office say - see who they have down as the owner and contact them to say you would like to buy the land if they can show title. Or get a solicitor to organise a Registry of Deeds search from the last known owner ( someone in the locality surely knows the history of ownership).
IMO, it is not always possible to find out who owns what or acquire good title in these circumstances.
mf