Boundary disputes and deslinde between neighbors in Peru

What is deslinde y amojonamiento?

Deslinde is the process for precisely determining where the dividing line between two neighboring properties runs, when that line is confused, disputed, or was simply never clearly established on the ground. Amojonamiento is the complementary step: once that line is fixed, physical markers (mojones) are placed to mark it visibly and permanently.

These two concepts usually go together because, in practice, one does not mean much without the other: agreeing where the boundary is does little good if it is not marked in a way that both neighbors — and any future buyer — can clearly identify.

The right to compel it: Article 966 of the Civil Code

Peru’s Civil Code (Decreto Legislativo N.° 295, 1984) governs this figure within Book V, on Property Rights (Derechos Reales). Its Article 966 states, in its exact words, that ‘el propietario de un predio puede obligar a los vecinos, sean propietarios o poseedores, al deslinde y al amojonamiento’ — the owner of a property can compel neighbors, whether owners or possessors, to the deslinde and amojonamiento.

In practice, this means two important things:

• The neighbor does not need to “want” to cooperate: the law gives you the right to demand it, even if the neighbor is only a possessor of the property (not necessarily its registered owner).
• A deslinde does not depend on bad faith or an open conflict existing: it is enough that the dividing line is confused, or that the existing markers do not match reality, for the right to be exercised.

What the Supreme Court clarified about its scope

A ruling by Peru’s Supreme Court, Casación N.° 26721-2017-Junín (28 February 2021), clarified the real purpose of a demanda de deslinde: to establish or clarify the boundary between two properties “cuando estas se encuentran confundidas o los linderos existentes no son los verdaderos” — when they are confused or the existing markers are not the true ones.

This matters because it clears up a common confusion: a deslinde is not, strictly speaking, a general action for a judge to decide who the “true owner” of a disputed piece of land is. Its specific function is to clarify a confused dividing line. That said, the Supreme Court itself recognized that this is an action inherent to property ownership, protecting its exclusive and perpetual character, and that it can have a reivindicatory effect — that is, restoring possession — when, upon correctly fixing the boundary, it turns out that part of the property had in fact been usurped. In the case decided by this cassation, which was declared founded (fundada), the Court ordered that the deslinde and amojonamiento proceed given the confirmed boundary confusion.

Practical steps in a boundary dispute

As a general roadmap, here is the recommended order for approaching a boundary dispute with a neighbor:

1. Talk to the neighbor first. Many boundary mix-ups are resolved simply by comparing titles and survey plans, without any formal procedure.
2. Gather your documentation: property title, SUNARP registry record, and any available perimeter or location survey plan.
3. Consider a surveyor or land engineer to produce an updated plan and compare coordinates against what is registered with the public registry.
4. If you reach an agreement, formalize it — ideally through a notarized deed — and register it with SUNARP, so it is protected against future owners.
5. If there is no agreement, consider the judicial route, filing a demanda de deslinde based on Article 966 of the Civil Code, so a judge fixes the dividing line definitively.

On costs and the so-called “dual process”: what secondary sources say

Beyond what Article 966 directly establishes, there is additional legal commentary — from secondary sources, not from a normative text independently verified in this session — worth mentioning with the appropriate caveats:

In practice, a deslinde is often described as working as a “dual process,” in which both parties must prove their property right by presenting their respective titles, rather than only one side carrying that burden. It is also commonly noted that the costs of the demarcation tend to be shared between the property owners involved, especially when the deslinde is resolved by mutual agreement.

These two ideas are consistent with how a deslinde is generally described in Peruvian legal practice, but they are not part of the verified verbatim text of Article 966, nor were they checked in this session against the Código Procesal Civil. Treat them as general guidance, not a settled legal rule, and confirm the details with a lawyer before assuming how costs will be split in your specific situation.

This is not the same as…

A deslinde is often confused with two other situations that also involve neighbors and land, but which solve different problems:

• Right-of-way easement (servidumbre de paso): a deslinde is about fixing where the dividing line between two properties runs. A right-of-way easement, by contrast, is the right to cross a neighbor’s land when your own property — with perfectly clear boundaries — has no adequate access to a public road. These are independent problems: you can need an easement without any boundary dispute, or have a boundary dispute with no access problem at all.
• Land invasion (invasión de terrenos): a deslinde starts from confusion about where the correct dividing line is. Land invasion and property trafficking is a different problem: someone deliberately occupies a property (or part of it) knowing, in principle, that it is not theirs, regardless of exactly where the boundary line sits. If your situation is clearly an occupation rather than a confused line, that guide is the more relevant one.

Note on this page’s status

This page is marked parcial (partial) because, although the core right — the obligation of deslinde y amojonamiento under Article 966 of the Civil Code, and its scope per the Supreme Court — was verified directly against an official source (El Peruano), the procedural details about exactly how a demanda de deslinde is filed, how costs are split, and how it interacts with the Código Procesal Civil come from secondary legal commentary that was not independently checked in this session. Before using this page to decide on a specific boundary dispute, confirm the details with a lawyer or directly through Peru’s Sistema Peruano de Información Jurídica (SPIJ).