Region IV-B

Also known as: Region 4-B · MIMAROPA · Southern Tagalog Islands · Southwestern Tagalog Region

Definition

Region IV-B (officially designated as MIMAROPA) is an administrative region of the Philippines located in the southwestern portion of Luzon. It is separated from the mainland by the Verde Island Passage, Tablas Strait, and Mindoro Strait. The region consists of five island provinces—Marinduque, Occidental Mindoro, Oriental Mindoro, Palawan, and Romblon—and is known for its marine biodiversity, ecotourism destinations (such as El Nido and Coron in Palawan), and rich agricultural and mineral resources. (Official Gazette)

Identities

Source Type	Identity
Wikipedia	Mimaropa
Wikidata	Q13644
DBpedia	Mimaropa
ProductOntology	N/A
Wiktionary	N/A
Library of Congress Subject Headings (LCSH)	Mimaropa (Philippines)
MeSH	N/A
NCBI Taxonomy	N/A
AGROVOC	N/A
Google Scholar	Region IV-B MIMAROPA island provinces ecotourism Palawan Philippines
ConceptNet	N/A
OpenCyc	N/A

Also Known As

Region 4-B
MIMAROPA
Southern Tagalog Islands
Southwestern Tagalog Region

Examples and Analogies

Palawan Ecotourism Protection: The enforcement of strict environmental zoning and building height caps in El Nido and Coron to protect marine reserves and limestone cliffs.
Romblon Marble Industry: The mining and processing of high-quality marble in Romblon, which serves as a major construction material supply source for the domestic market. (Official Gazette)

Usage Scenarios

1. Ecotourism Development Permitting

A resort developer applies for an Environmental Compliance Certificate (ECC) from the DENR-EMB to construct an overwater bungalow resort in Palawan.

2. Inter-Island Logistics Planning

A shipping company plans new roll-on/roll-off (RoRo) ferry routes connecting Calapan City, Oriental Mindoro (the regional center of Region IV-B) to Batangas Port. (Official Gazette)

Strategies

Research the municipal zoning maps and protected areas (NIPAS) before acquiring land for tourism development in Palawan or Romblon.
Invest in off-grid energy systems (such as solar or diesel generators), as many island municipalities suffer from power grid instability.
Work with licensed geodetic engineers to verify property coordinates, especially for beachfront land acquisitions.

Security and Safety Measures

Do not purchase land inside designated marine sanctuaries or strict protection zones, as these are public domains under NIPAS law.
Ensure all structures are built to withstand high-velocity winds and storm surges, as the islands are vulnerable to open-sea typhoons.
Verify title records directly at the Registry of Deeds in Puerto Princesa, Calapan, or Mamburao.

Historical Context

Originally part of the massive Southern Tagalog region (Region IV) established on September 24, 1972, under President Ferdinand Marcos’ Integrated Reorganization Plan No. 1, MIMAROPA was created when the region was split in two on May 17, 2002, under Executive Order No. 103 signed by President Gloria Macapagal-Arroyo. In 2016, Republic Act No. 10879 formally established the MIMAROPA Region, renaming it the Southwestern Tagalog Region and reinforcing Calapan City as the administrative hub. (Official Gazette)

Challenges and Controversies

Power and Water Deficits

The island provinces are not connected to the national electricity grid, resulting in high power generation costs, frequent blackouts, and water supply issues during peak tourist seasons.

Illegal Fishing and Encroachment

The region’s vast marine territories are vulnerable to illegal commercial fishing and environmental encroachment, causing conflicts with local artisanal fishing communities.

References

Official Gazette of the Republic of the Philippines