Draw a sketch map of the bay indicating its landscape, aspect, approximate positions of the high tide mark and low tide mark and position of the transect line.

绘画一张研究范围的简图，图中应包括地形、样条的位置和方向、高潮线和低潮线位置等有关因素。

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Dylan's body was found on Thursday on the mud flats at the high tide mark less than half a mile from where he went into the water.

BBC: Dylan Cecil sea fall death: Memorial service in Burnham

High water mark: the highest reach of the water at high tide.

UNESCO: L O S S A R Y

The tide had risen well beyond the high water mark.

NPR: A Hippo and Tortoise Tale