In one part of the upper reaches of the Madison river, a whole mountain began shifting, then came crashing down to fill the deep valley and dam the great river with millions of tons rock and trees.

在麦迪生河上游的一条支流处，一整座山开始移动，之后，它崩塌下来填满深深的山谷，上百万吨岩石和大树如坝般阻挡住大河。

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Nicknamed "the bathtub ring", this discolouration comes from minerals that were once deposited on the volcanic rock by the Colorado River and have become visible as its level has dropped.

这条被俗称为“浴缸圈”的条纹形成于沉积在科罗拉多河旁火山岩中的矿物质，随着水位不断的下降如今显现了出来。

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White snow tops the mountains to the west, and the river and lake-clouded with finely ground rock-are silver.

白雪覆盖的山顶在西侧，河流和湖泊呈现为银色——表面被磨细的灰尘覆盖着。

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Below,the flowing river continued to uncover more and more levels of ancient rock.

VOA: special.2009.10.07

Our planned route took us, over two nights and three days, from the rustic Wild River Campground, along Meader Ridge, over the rock-strewn Carter Dome and along winding trails skirting Moriah Brook and Wild River back to our starting point.

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At 277 miles long and more than a mile deep, its intricate formations are matched only by the stunning striation of the rock, and by the knowledge that the entire thing was carved out by the Colorado River on a 5-million-year mission.

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Over the centuries, the river had slowly carried away mountainsides, tumbling and cracking rock, reducing boulders into a rainbow of smooth, flat stones the size of a child's hand.

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