A hole or gap in the ground, typically a ditch or eroded channel where water runs off during heavy rain.
From 'gully' (a water-worn ravine) plus 'hole'. A gully is a channel created by running water, and a gullyhole is literally the opening or depression formed by such erosion.
Gullyholes are nature's testimony to water's power—a single rainstorm repeated over years can carve through earth to create these visible scars in the landscape, and farmers have been naming and fighting them for centuries.
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