The so-called Lava Lands cover a huge area of central Oregon, with the greatest concentration of sizeable lava formations - conical buttes, craggy caves and the rocky molds of tree trunks - in the Bend area located at Newberry National Volcanic Monument (dawn-dusk; five-day parking passes $5; ). Dating back seven thousand years to the eruption of Mount Newberry, the monument is actually a huge, sloping crater laced with hiking paths, nature trails, campgrounds, and prime fishing spots. Some of the rugged highlights (most free with monument admission) include the chilly, mile-long Lava River Cave (summer daily 9am-5pm; $3, plus $2 for a lamp), an eerie but walkable subterranean passage made from a hollow lava tube; the Lava Cast Forest , a strange walk through the basalt casts of trunks of trees burnt by lava before they could fall; and the surreal landscape of the Big Obsidian Flow , huge hills of volcanic black glass that native tribes throughout the Northwest once used to make arrowheads. As the rock is still quite sharp and brittle - and especially rare - you're strongly advised not to take home any geological souvenirs. The Lava Lands visitors center (summer daily 9am-5pm; tel 541/593-2421; $5), eleven miles south of Bend on US-97, is an excellent source of maps and information on hiking trails.

Lava Lands

• Lava Lands

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