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A jumble of large rocks and small boulders in an Australian creekbed
Some people choose to climb larger-sized boulders for recreational purposes or as a method of training for mountaineering and free climbs[?]. This practice is known as bouldering.
Example of an extremely large boulder - note size of tree for comparison.
There are several towns in America named Boulder or with boulder in their names. See
wikipedia.org dumped 2003-03-17 with terodump