List of areas in the United States National Park System
National preserves
There are 21 national preserves in the United States. Ten are distinct stand-alone official units of the National Park System, while nine others are merely areas of distinct management policies and land-use restrictions within a larger "national park and preserve" or "national monument and preserve" that are counted as two units of the National Park System by the National Park Service.

List of areas in the United States National Park System

Section Title: National preserves
Table Section Text: There are 21 national preserves in the United States. Ten are distinct stand-alone official units of the National Park System, while nine others are merely areas of distinct management policies and land-use restrictions within a larger "national park and preserve" or "national monument and preserve" that are counted as two units of the National Park System by the National Park Service.

Name	Location	Area (2017)

Aniakchak National Monument and Preserve	Alaska	464,117.93 acres (1,878.2186 km2)

Bering Land Bridge National Preserve	Alaska	2,697,391.01 acres (10,915.9541 km2)

Big Cypress National Preserve	Florida	720,564.01 acres (2,916.0191 km2)

Big Thicket National Preserve	Texas	113,121.96 acres (457.7883 km2)

Craters of the Moon National Monument and Preserve	Idaho	698,939.69 acres (2,828.5086 km2)

Denali National Park and Preserve	Alaska	1,334,117.80 acres (5,398.9832 km2)

Gates of the Arctic National Park and Preserve	Alaska	948,608.07 acres (3,838.8807 km2)

Glacier Bay National Park and Preserve	Alaska	58,406.00 acres (236.3607 km2)

Great Sand Dunes National Park and Preserve	Colorado	41,686.00 acres (168.6973 km2)

Jean Lafitte National Historical Park and Preserve	Louisiana	22,420.86 acres (90.7340 km2)

Katmai National Park and Preserve	Alaska	418,698.80 acres (1,694.4139 km2)

Lake Clark National Park and Preserve	Alaska	1,410,293.68 acres (5,707.2560 km2)

Little River Canyon National Preserve	Alabama	15,288.58 acres (61.8707 km2)

Mojave National Preserve	California	1,545,685.49 acres (6,255.1673 km2)

Noatak National Preserve	Alaska	6,587,071.39 acres (26,656.9322 km2)

Oregon Caves National Monument and Preserve	Oregon	4,554.03 acres (18.4295 km2)

Tallgrass Prairie National Preserve	Kansas	10,882.67 acres (44.0406 km2)

Timucuan Ecological and Historic Preserve	Florida	46,262.67 acres (187.2184 km2)

Valles Caldera National Preserve	New Mexico	89,766.09 acres (363.2705 km2)

Wrangell-St. Elias National Park and Preserve	Alaska	4,852,644.52 acres (19,637.9556 km2)

Yukon-Charley Rivers National Preserve	Alaska	2,526,512.44 acres (10,224.4331 km2)

Sentence(s)

The Big Thicket National Preserve in Texas and Big Cypress, are the National preserves in the United States National Park System.
The Big Cypress and Big Thicket National Preserve in Texas are the national preserves in the United States National Park System.

final_sentence: The Big Thicket National Preserve in Texas and Big Cypress, are the National preserves in the United States National Park System.
final_sentence: The Big Cypress and Big Thicket National Preserve in Texas are the national preserves in the United States National Park System.