This is a matter of opinion, so it's hard to answer. There are 5 national parks in Utah. Each one has its own special features and parts:
It can be found in the upper northeast corner of Utah; nearest city is vernal, Utah
The Sawtooth National Forest is in South Eastern Idaho, extending into Western Utah.
There is a balanced rock in Arches national Park, Utah USA and I believe it is the largest?
Delicate Arch, at Arches National Park in Utah, is composed of sandstone.
Arenal Volcano National Park Barbilla National Park Barra Honda National Park Braulio Carrillo National Park Cahuita National Park Carara National Park Chirripó National Park Cocos Island National Park Corcovado National Park Diria National Park Guanacaste National Park Irazú Volcano National Park Juan Castro Blanco National Park La Amistad International Park La Cangreja National Park Las Baulas National Marine Park Manuel Antonio National Park Maquenque National Park (proposed) Palo Verde National Park Piedras Blancas National Park Poás Volcano National Park Rincón de la Vieja Volcano National Park Santa Rosa National Park Tapantí National Park Tenorio Volcano National Park Tortuguero National Park Turrialba Volcano National Park
The Arches National Park.
Wasatch Mountain State Park became Utah's first national state park in 1859.
Zion National Park, Utah.
Utah
Zion National Park
There are 5 National Parks in Utah: Zion National Park Bryce Canyon Arches National Park Canyonlands National Park Capitol Reef National Park But the Northern Rim of The Grand Canyon National Park is located in Utah, so that can be considered as a park of Utah.
Arches National Park is in a semi desert region of Utah.
Arches National Park is in Utah.
Southwestern Utah
Utah
Zion National Park
Canyonlands is a National Park operated by the National Park Service. It is in Utah.