Can foreclose on land belongs to someone else?

No, a lender cannot foreclose on land that belongs to someone else. Foreclosure is a legal process that allows a lender to take possession of a property when the borrower defaults on their loan, but it can only be initiated against property that is legally owned by the borrower. If a lender attempted to foreclose on land owned by someone else, it would be considered unlawful and could be contested in court.