August 1, 2011

Swimmer, Portugal

Photograph by Peter Essick, National Geographic

This Month in Photo of the Day: National Geographic Magazine Features

Windowpane clear and bracingly cold, the Homem River and other swimming spots draw thousands of visitors to Peneda-Gerês on summer weekends. The seasonal invasion challenges the park's year-round residents and wildlife.

See more pictures from the July 2011 feature story "The Delicate Balance of Portugal's Premier Park."

See more pictures of European parks »
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