There were grades in the population intension level from the lower reaches of the river to the upper river.

整个流域的人口分布沿黄河河道由下游往上，人口密集程度呈梯度递减的特征。

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Tonight, let's enjoy together the harp solo by the young performer Li Yange: Clear and Bright Upper River Picture.

今晚，让我们一起欣赏青年演奏家李彦歌的箜篌独奏：《清明上河图》。

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Officials could close shipping connections between Lake Michigan and the upper Mississippi River system.

VOA: special.2009.12.15

The impressive views continue as it speeds alongside the cliffs and canyons of the upper Colorado River, before descending into the deserts of Utah and Nevada.

BBC: Five unforgettable rail journeys

It covers an area roughly half the size of France within the Upper Paraguay River Basin, extending over the border into Paraguay and Bolivia.

BBC: Brazil��s land of the jaguar

The purchases included almost 20 miles of upper Hudson River shoreline.

WSJ: OUT THERE: Upper Hudson opening to canoeists