International Union for Conservation of Nature Protected Area Management Categories and Global Classification Atlas

IUCN Category Ia represents the most tightly protected end of the protected-area spectrum. A Strict Nature Reserve is primarily established to conserve biodiversity, geodiversity, or especially fragile ecological conditions by keeping direct human pressure extremely low. These areas are usually not designed around recreation, broad tourism, or everyday public access. Instead, they are places where ecological integrity comes first, and where entry, use, and management interventions are normally limited to what is necessary for conservation, research, monitoring, and tightly controlled stewardship.

Parks

147

Countries

22

Continents

6

Example parks: Commander Islands, Tsingy de Bemaraha Strict Nature Reserve, Swiss National Park, Teberda Nature Reserve, Crimean Nature Reserve, Khosrov Forest State Reserve

IUCN Category Ib is used for large areas where natural character, ecological continuity, and the experience of wildness are central to protection. A Wilderness Area is not defined merely by scenic value or low population density. It is protected because it remains largely free from industrial development, intensive infrastructure, and permanent or significant human settlement, and because preserving that condition is itself a major conservation goal. Category Ib sits close to Category Ia in its strong protection emphasis, but it is distinguished by scale, landscape continuity, and the explicit idea of wilderness as a value to be maintained.

Parks

188

Countries

10

Continents

6

Example parks: Lemmenjoki National Park, Congaree National Park, Isle Royale National Park, Nxai Pan National Park, Yengo National Park, Barrington Tops National Park

IUCN Category II is one of the most widely recognized protected-area categories in the world because it brings together strong ecosystem protection and public-facing values. A National Park is meant to conserve large-scale ecological processes and representative species and ecosystems, but it is also expected to support compatible spiritual, scientific, educational, recreational, and visitor opportunities. This makes Category II especially important for countries that want protected areas to function both as core conservation landscapes and as places where people can meaningfully experience nature without undermining long-term ecological goals.

Parks

2,566

Countries

150

Continents

6

Example parks: Grand Canyon National Park, Yellowstone National Park, Yosemite National Park, Serengeti National Park, Galápagos National Park, Banff National Park

IUCN Category III is designed for places where protection centers on a particular natural feature rather than on a very large ecosystem or wilderness landscape. The protected feature may be geological, geomorphological, marine, biological, or a striking living element of nature such as an ancient grove or monumental tree stand. The category is especially useful when a specific natural landmark carries exceptional ecological, scientific, cultural, educational, or scenic importance and needs focused legal and management protection.

Parks

148

Countries

14

Continents

5

Example parks: Puerto Princesa Subterranean River National Park, Jenolan Karst Conservation Reserve, Blue Eye, Sleeping Bear Dunes National Lakeshore, Pictured Rocks National Lakeshore, MacMillan Provincial Park

IUCN Category IV is built around focused ecological management. Rather than emphasizing wilderness, a singular monument, or broad public recreation, this category is used where the central task is to maintain, conserve, restore, or manage particular species, habitats, or ecological conditions. Many Category IV areas require active intervention, sometimes on an ongoing basis, because their conservation values depend on management actions such as water-level control, grazing regimes, fire management, invasive-species removal, nest-site protection, or habitat restoration. The category is especially important for places where biodiversity goals are precise, operational, and management-intensive.

Parks

1,108

Countries

53

Continents

6

Example parks: Aïr and Ténéré National Nature Reserve, Wadi Mujib, Arli National Park, Gir National Park, National History Park, Zwin

IUCN Category V recognizes that some of the world's most valuable conservation landscapes are not places without people, but places shaped by a long and continuing interaction between people and nature. In these areas, biodiversity, cultural identity, local livelihoods, scenic quality, and historical land-use patterns are often deeply intertwined. The category is used where safeguarding the integrity of that interaction is itself essential to conservation. Category V is therefore especially relevant to lived-in landscapes and seascapes whose value depends on continuity, stewardship, and the maintenance of characteristic ecological and cultural patterns over time.

Parks

315

Countries

37

Continents

6

Example parks: Redwood National and State Parks, Acadia National Park, Denali National Park and Preserve, Lake District National Park, Cinque Terre National Park, Glacier Bay National Park and Preserve

IUCN Category VI is used for protected areas where conservation remains primary, but where the sustainable use of natural resources is recognized as a legitimate and integrated part of management. These are usually large areas that remain mainly in a natural condition and that conserve ecosystems, associated cultural values, and traditional resource-management systems. The category is especially important in places where conservation is best achieved not by excluding all use, but by supporting forms of use that are low-level, non-industrial, ecologically compatible, and embedded in long-term stewardship.

Parks

151

Countries

34

Continents

6

Example parks: Rwenzori Mountains National Park, Pacific Rim National Park Reserve, Gulf Islands National Park Reserve, Shoshone National Forest, Zlatibor, Dadia-Lefkimi-Soufli Forest National Park