
A transboundary protected area (TBPA) is an ecological protected area that spans boundaries of more than one country or sub-national entity. Such areas are also known as transfrontier conservation areas (TFCAs) or peace parks.

The Algonquin to Adirondacks Collaborative (A2A) is an environmental NGO, a registered charity, and a not-for-profit multi-national. This network of partners works together to connect lands and people from Algonquin Provincial Park in Ontario, Canada to the Adirondacks in New York State. The Algonquin to Adirondacks region represents a critical link for biodiversity and resilience in North America.
Białowieża Forest is one of the last and largest remaining parts of the immense primeval forest that once stretched across the European Plain. The forest is home to 800 European bison, Europe's heaviest land animal. UNESCO's Man and the Biosphere Programme designated the Polish Biosphere Reserve Białowieża in 1976 and the Belarusian Biosphere Reserve Belovezhskaya Puschcha in 1993. In 2015, the Belarusian Biosphere Reserve occupied the area of 216,200 ha, subdivided into transition, buffer and core zones. The forest has been designated a UNESCO World Heritage Site and an EU Natura 2000 Special Area of Conservation. The World Heritage Committee by its decision of June 2014 approved the extension of the UNESCO World Heritage site "Belovezhskaya Pushcha/Białowieża Forest, Belarus, Poland", which became "Białowieża Forest, Belarus, Poland". It straddles the border between Poland and Belarus, and is 70 kilometres north of Brest, Belarus and 62 kilometres southeast of Białystok, Poland. The Białowieża Forest World Heritage site covers a total area of 141,885 ha . Since the border between the two countries runs through the forest, there is a border crossing available for hikers and cyclists.

Breaks Interstate Park is a bi-state state park located partly in southeastern Kentucky and mostly in southwestern Virginia, in the Jefferson National Forest, at the northeastern terminus of Pine Mountain. Rather than their respective state park systems, it is instead administered by an interstate compact between the states of Virginia and Kentucky. It is one of several interstate parks in the United States, but only one of two operated jointly under a compact rather than as two separate state park units. The Virginia Department of Conservation and Recreation and the Kentucky Department of Parks are still major partner organizations, however.

Carlingford Lough is a glacial fjord or sea inlet that forms part of the border between Northern Ireland to the north and the Republic of Ireland to the south. On its northern shore is County Down and on its southern shore is County Louth. At its extreme interior angle it is fed by the Newry River and the Newry Canal.

Cartierheide is a natural landscape area in the south of the Netherlands in province Noord-Brabant located close to the Belgian border in the natural region called The Campine . On the other side of the border is Belgium's first national park, Hoge Kempen.
The Douro International Natural Park is one of the thirteen natural parks of Portugal. It is located in the municipalities of Miranda do Douro, Mogadouro, Freixo de Espada à Cinta and Figueira de Castelo Rodrigo, spanning a lengthy area along the Douro River where it functions as the border between Portugal and Spain. The park also goes includes the border area of the Águeda River. The park was created to protect the scenic landscape of the region, as well as its flora and fauna.

The George Washington and Jefferson National Forests is an administrative entity combining two U.S. National Forests into one of the largest areas of public land in the Eastern United States. The forests cover 1.8 million acres (7,300 km2) of land in the Appalachian Mountains of Virginia, West Virginia, and Kentucky. Approximately 1 million acres (4,000 km2) of the forest are remote and undeveloped and 139,461 acres (564 km2) have been designated as wilderness areas, which eliminates future development.

The International Peace Garden is a 3.65-square-mile (9.5 km2) park located adjacent to the International Peace Garden Border Crossing along the Canada–United States border between the province of Manitoba and the state of North Dakota. It was established on July 14, 1932, as a symbol of the peaceful relationship between the two countries.

The Internationaler Naturpark Bourtanger Moor-Bargerveen is a nature reserve in the west of the German state Lower Saxony as well as in the North-East of the Netherlands. Mostly this nature reserve is spread out over the German counties Emsland, Grafschaft Bentheim and the Dutch province Drenthe. The landscape within the nature park is characterised by big peat areas, heather, small lakes and a very low human population density. The Bourtanger Moor-Bargerveen International Nature Park was founded on June 1, 2006.

Kavango–Zambezi Transfrontier Conservation Area was a conservation proposal for a region of Southern Africa where the international borders of five countries converge. It was to include a major part of the Upper Zambezi River and Okavango basins and Delta, the Caprivi Strip of Namibia, the southeastern part of Angola, southwestern Zambia, the northern wildlands of Botswana and western Zimbabwe. The centre of this area is at the confluence of the Zambezi and Chobe Rivers where the borders of Botswana, Namibia, Zambia and Zimbabwe meet. It would have incorporated Chobe National Park, Hwange National Park, and the Victoria Falls.

Klondike Gold Rush National Historical Park is a national historical park operated by the National Park Service that seeks to commemorate the Klondike Gold Rush of the late 1890s. Though the gold fields that were the ultimate goal of the stampeders lay in the Yukon Territory, the park comprises staging areas for the trek there and the routes leading in its direction. There are four units, including three in Municipality of Skagway Borough, Alaska and a fourth in the Pioneer Square National Historic District in Seattle, Washington.

The La Amistad International Park, or in Spanish Parque Internacional La Amistad, formerly the La Amistad National Park, is a Transboundary Protected Area in Latin America, management of which is shared between Costa Rica and Panama, following a recommendation by UNESCO after the park's inclusion in the World Heritage Site list.

The Lower Oder Valley International Park is a shared German-Polish nature reserve. It comprises the western banks of the Oder river within the Uckermark district in the German state of Brandenburg as well as the steep eastern banks in the Gryfino and Police counties of the Polish West Pomeranian Voivodeship further north.

The Marble Arch Caves Global Geopark straddles the border between Northern Ireland and the Republic of Ireland. It is centred on the Marble Arch Caves and in 2001 it became one of the first geoparks to be designated in Europe.

The Mexico–United States international park is a proposed and partially completed cross-border wilderness park straddling the part of the U.S.–Mexico boundary delineated by the Rio Grande.

Mount Nimba Strict Nature Reserve is a protected area and UNESCO World Heritage Site located in both Guinea and Côte d'Ivoire, extending over a total of area of 17,540 hectares, with 12,540 hectares in Guinea, and 5,000 hectares in Côte d'Ivoire. The reserve covers significant portions of the Nimba Range, a geographically unique area with unusually rich flora and fauna, including exceptional numbers of single-site endemic species, such as viviparous toads, and horseshoe bats. Its highest peak is Mount Richard-Molard at 1,752 m (5,750 ft), which is the highest peak of both countries.

Peace Arch Park is an international park consisting of Peace Arch Historical State Park in the United States and Peace Arch Provincial Park in Canada. The park straddles the international boundary between the two countries at the extreme western end of the main contiguous section of the two countries' land border, between Blaine, Washington, United States, and Surrey, British Columbia, Canada, where it reaches Semiahmoo Bay of the Salish Sea on the continent's Pacific Coast. The park's central feature is the Peace Arch.

Pieniny National Park is a protected area located in the heart of Pieniny Mountains in the southernmost part of Poland. Administratively, the Park lies in the Lesser Poland Voivodeship on the border with Slovakia. Its head office is in Krościenko nad Dunajcem.

Pieniny National Park is a national park in northern Slovakia. The park is located in the eastern Pieniny Mountains on the border with Poland. It is the smallest national park in Slovakia with an area of 37.49 km² (14.48 mi²) and a buffer zone of 224.44 km² (86.66 mi²). The park is located in the Slovak districts of Kežmarok and Stará Ľubovňa in the Prešov Region.

Ancient and Primeval Beech Forests of the Carpathians and Other Regions of Europe is a transnational composite nature UNESCO World Heritage site, encompassing forests in 12 European countries.

The Pyrénées – Mont Perdu World Heritage Site is a World Heritage site straddling the border between Spain and France in the Pyrenees mountain chain. The summit of Monte Perdido is on the Spanish side of the border. The site was designated in 1997 and extended north in 1999 to include the Commune of Gèdre in France.

Saint Croix Island, long known to locals as Dochet Island, is a small uninhabited island in Maine near the mouth of the Saint Croix River that forms part of the Canada–United States border separating Maine from New Brunswick. The island is in the heart of the traditional lands of the Passamaquoddy people who, according to oral tradition, used it to store food away from the dangers of mainland animals. The island was the site of an early attempt at French colonization by Pierre Dugua, Sieur de Mons in 1604. In 1984 it was designated by the United States Congress as Saint Croix Island International Historic Site. There is no public access to the island, but there is a visitor contact station on the U.S. mainland and a display on the Canadian mainland opposite the island.

The International Tagus Natural Park is a protected area in Portugal and Spain.

The Wadden Sea National Parks in Denmark, Germany and the Netherlands are located along the German Bight of the North Sea. In Germany and Denmark they also mark the area of the UNESCO World Heritage Site of the Wadden Sea. Divided from each other by administrative borders, they form a single ecological entity. The purpose of the national parks is the protection of the Wadden Sea ecoregion.

The Waterton-Glacier International Peace Park is the union of Waterton Lakes National Park in Canada and Glacier National Park in the United States. Both parks are declared Biosphere Reserves by UNESCO and their union as a World Heritage Site.
De Zoom–Kalmthoutse Heide Cross-Border Park is a cross-border park on the Belgian–Dutch border. It is a merger of two former parks, the Kalmthoutse Heide (Kalmthout Heath) in Belgium and De Zoom in the Netherlands, together extending over 37.50 square kilometres (14.48 sq mi). A very large part of the park is covered with heath.

The Zwin is a nature reserve at the North Sea coast, on the Belgian-Dutch border. It consists of the entrance area of a former tidal inlet which during the Middle Ages connected the North Sea with the ports of Sluis and Bruges inland.