I. Introduction

This memorandum provides an exhaustive analysis of the Philippine legal regime governing foreshore lands, with a primary focus on the absolute prohibition against their acquisition by private persons or entities. The analysis will trace the constitutional and statutory foundations of this rule, define the key property concepts involved, examine the jurisdictional and administrative framework, and address related doctrines and contemporary challenges. The principle that foreshore lands are part of the inalienable public domain is a cornerstone of Philippine property law, intended to preserve public access to natural resources and protect the state’s patrimony.

II. Constitutional and Statutory Foundations

The prohibition on private ownership of foreshore lands is rooted in the fundamental law and codified statutes.
The 1987 Constitution, under Article XII, Section 2, declares that all lands of the public domain*, waters, minerals, coal, petroleum, and other mineral oils, all forces of potential energy, fisheries, forests or timber, wildlife, flora and fauna, and other natural resources are owned by the State. It further provides that with the exception of agricultural lands, all other natural resources shall not be alienated.
The Public Land Act (Commonwealth Act No. 141, as amended) serves as the primary statute governing the classification and disposition of lands of the public domain. Section 13 of CA 141 explicitly prohibits the concession, sale, or lease of foreshore lands* for residential, commercial, industrial, or other productive purposes, except to qualified persons who are leaseholders of adjoining uplands. This limited exception is strictly construed.
The Civil Code of the Philippines provides the general classification of property. Article 420 classifies property as either of public dominion or of private ownership. Property of public dominion includes those intended for public use, such as roads, canals, rivers, torrents, ports, and bridges constructed by the State, and banks, shores, roadsteads, and others of similar character. Foreshore lands fall under this category as shores*.

III. Definition and Delimitation of Key Terms

Precise definition is critical to the application of the rule.
Foreshore Land: That strip of land that lies between the high and low water marks and is alternately wet and dry according to the flow of the tide. It is that part of the alienable and disposable land of the public domain which is contiguous to and submerged by the ordinary tides. It is the zone of the shore* which is daily washed by the tide.
High Water Mark: The line reached by the highest tide during the year. It is the landward boundary of the foreshore*.
Low Water Mark: The line reached by the lowest tide during the year. It is the seaward boundary of the foreshore*.
Public Domain: All lands and natural resources belonging to the State, classified into alienable and disposable, timber, and mineral lands. Foreshore lands, while potentially classified as alienable and disposable in terms of their physical character, remain legally inalienable due to their character as property of public dominion*.
Property of Public Dominion (Dominio Publico): Property belonging to the State that is either intended for public use (uso publico) or intended for some public service or the development of the national wealth. It is outside the commerce of man and cannot be acquired by prescription* or private ownership.

IV. The Regalian Doctrine: The Underlying Principle

The entire framework rests upon the Regalian Doctrine (Jura Regalia). This doctrine, embodied in the Constitution, posits that all lands and natural resources originally belonged to the State, and that private title must be proven to have been derived from a legitimate grant from the State. The burden of proof rests upon the person claiming ownership against the State. Since foreshore lands are, by legal definition, part of the inalienable public domain, no valid title can be secured from the State, and any alleged ownership is void ab initio. The State’s ownership is absolute and not subject to prescription.

V. Jurisdiction and Administration

Administrative control and jurisdiction over foreshore lands are vested in specific state agencies.
The Department of Environment and Natural Resources (DENR), through the Land Management Bureau (LMB), has primary jurisdiction over the survey, classification, and management of lands of the public domain, including foreshore lands*.
The Philippine Reclamation Authority (PRA), created under Presidential Decree No. 1084, has the exclusive mandate to undertake the reclamation of all lands, including foreshore areas*. No reclamation project can proceed without PRA approval.
Local Government Units (LGUs) may exercise certain regulatory functions, but they cannot alienate or grant ownership over foreshore lands*. Their authority is limited to the issuance of permits for temporary use, subject to national laws and regulations.

VI. Modes of Acquisition and the Limited Exception

Given the prohibition on ownership, private individuals and entities may only acquire a limited, temporary right to use foreshore lands.
Lease: The primary mode is through a Foreshore Lease Agreement (FLA) issued by the DENR under the provisions of CA 141 and DENR administrative orders. FLAs are granted for a specific period (typically 25 years, renewable) for purposes such as ports, piers, fishponds, or other beneficial economic uses. The grantee acquires only a possessory right*, not ownership.
The Adjoining Upland Lessee Exception: As noted in Section 13 of CA 141, a qualified person who is a lessee of adjoining upland may be granted a lease of the adjoining foreshore land*. This is not a general right but a specific statutory privilege that is strictly interpreted. The upland lease must be valid and subsisting.
Reclamation: Reclaimed areas on foreshore lands remain property of the public domain unless officially classified as alienable and disposable* and subsequently disposed of by the State, typically to the reclamation proponent. The PRA plays the central role in this process.

VII. Comparative Analysis: Foreshore Lands vs. Similar Property Concepts

A clear distinction must be made between foreshore lands and other coastal properties.

VIII. Related Doctrines and Jurisprudence

Supreme Court decisions have consistently fortified the prohibition.
Nullity of Titles over Foreshore Lands: In Republic v. Court of Appeals and T.A.N. Properties, the Court held that a certificate of title covering foreshore land is void, as the land is not capable of registration. An action for the cancellation of such a void title is imprescriptible*.
Proof of Alienability: In Republic v. Vega, the Court reiterated that for land to be capable of private appropriation, it must first be shown to have been classified as alienable and disposable land of the public domain at the time the possession commenced. For foreshore lands, this is legally impossible due to their character as public dominion*.
Prescription Does Not Run Against the State: The principle of imprescriptibility of state property is paramount. Acquisitive prescription (usucapion) cannot vest ownership of foreshore lands in a private person, as prescription does not run against the State with regard to property of the public dominion* (Article 1113, Civil Code).
Doctrine of Reliction: If the sea permanently recedes, uncovering what was once foreshore, the uncovered land may become alienable and disposable land of the public domain*, provided there is a positive act from the State re-classifying it. It does not automatically accrue to the adjoining upland owner.

IX. Contemporary Issues and Challenges

The application of the rule faces modern complexities.
Coastal Erosion and Accretion: Climate change-induced sea-level rise and erosion can blur the physical high water mark, complicating demarcation. Accretion (the gradual addition of land by natural forces) to foreshore remains part of the public domain*.
Illegal Reclamation and Encroachment: Unauthorized filling and construction on foreshore lands* for commercial or residential use are persistent problems, often involving complex enforcement actions.
Ambiguous Boundaries in Old Titles: Antiquated property descriptions in old titles sometimes ambiguously reference shorelines, leading to claims that inadvertently include foreshore areas*. These claims are invalid.
Environmental and Public Access Concerns: The privatization or exclusive use of foreshore lands* conflicts with constitutional mandates for environmental protection and the state’s duty to protect the right of the people to a balanced and healthful ecology.

X. Conclusion

The rule prohibiting private ownership of foreshore lands is a clear, absolute, and non-negotiable principle in Philippine civil law. It is anchored in the Regalian Doctrine, codified in the Civil Code and the Public Land Act, and consistently upheld by jurisprudence. Foreshore lands are property of public dominion intended for public use and held by the State in trust for the people. While limited possessory rights via lease are permissible, any claim of private ownership, whether through Torrens title, prescription, or any other means, is legally void. Legal practitioners must exercise utmost diligence in verifying the true character of coastal properties, as the State’s ownership over foreshore lands is imprescriptible and any contrary title is subject to cancellation at any time.