Demarcation — paimaish
Where boundaries are disputed, the answer is a measurement on the ground against the record. An application for demarcation is made to the revenue authority; the Patwari or the revenue Amin measures the plot with reference to the Khasra, the map and the field book, and a report is submitted. That report, and the map it is measured against, are what a court will look at — not the wall, and not what the neighbours agree the position has always been.
Encroachment on private land
Where a neighbour has crossed the line, the remedies run in parallel and the choice depends on urgency. An injunction can stop construction that is under way. A suit for possession recovers the strip encroached upon. Where possession has been taken without due process, the summary remedy under Section 6 of the Specific Relief Act is available — but only for six months.
The instinct to pull down the wall personally should be resisted. It converts a case you would probably win into a criminal complaint against you.
Gram Sabha and public land
Encroachment on Gram Sabha land, on public paths, on water bodies or on common land is dealt with by the revenue authorities, who have power to order eviction and to impose damages. Courts have taken a consistently firm line: long occupation of common land does not ripen into a right, and regularisation is not something an encroacher can demand.
Preventing the dispute
The practical advice is unglamorous and it works. Get a demarcation done before you build, not after. Record the boundary in the sale deed by reference to the Khasra numbers and measurements rather than by describing neighbours. Photograph the site at purchase. And where a neighbour begins to encroach, write to them immediately — a dated letter is what converts a long silence from acquiescence into a documented objection.