Douglas C. Pizac, Associated Press
Terry Tempest Williams poses outside her home Friday, Nov. 9, 2001, in Castle Valley, Utah. Living in a remote valley in southeastern Utah, the naturalist author's love of the land defines her life.

MEDORA, N.D. — Author and environmental activist Terry Tempest Williams will speak Sunday at Theodore Roosevelt National Park in Medora.

The park says Williams will read portions of her most recent book "The Hour of Land" beginning at 6:30 p.m. at the South Unit Visitor Center.

Williams has a long history of advocating for protection of Utah's wild spaces. In February, she purchased development rights on a small stretch of land in that state during a federal oil-and-gas lease auction. At the time, she said she purchased the lease rights to shine a light on the negative effects of climate change.

Williams is also the author of "Refuge: An Unnatural History of Family and Place," ''Finding Beauty in a Broken World" and "When Women Were Birds."