Badlands National Park in South Dakota covers 244,000 acres or 380 square miles.
Makoshika State Park in Montana covers 11,000 acres of badlands.
Theodore Roosevelt National Park in North Dakota covers 110 square miles (285 km2).
Toadstool Geologic Park in Nebraska is only a few square miles in area.
Hell's Half Acre in Wyoming covers 320 acres (1.3 km2).
El Malpais National Conservation Area in New Mexico covers 231,230 acres with 114,277 acres of volanic landscape.
The Big Muddy Badlands in Sasketchewan, Canada and Montana, USA, are found in Big Muddy Valley which is 55 kilometres (34 mi) long and 3.2 kilometres (2.0 mi) wide.
Then there are the Putangirua Pinnacles in New Zealand, but no information regarding their area can be found.
The Bardenas Reales in Spain cover 42,000 hectares (100,000 acres).
Ischigualasto Provincial Park or Valle de la Luna("Valley of the Moon") in Argentina covers 603.7 km2 (233.1 sq mi).
The Gutingkeng Formation in Taiwan covers over 100,000 hectares.
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The Badlands National Park in South Dakota spans approximately 244,000 acres, which is roughly 382 square miles.
Mississippi has a total of 48,430 square miles.
137,847 square miles.
There are 0.440625 square miles in 282 acres.
Rome covers an area of about 496.3 square miles.
Bulgaria has an area of approximately 42,854 square miles.