Circular Big Hole offers a four-mile drive-around not far off the La Pine-to-Lakeview highway. (Terry Richard/The Oregonian) Late during my spring central Oregon blogging trip, I ran into members ...

The geological formation known as the Big Hole is 100 metres deep and 35 metres wide. Located in Deua National Park, it is thought to have formed about 50 million years ago when the roof of a cave ...