This is because the edge appears stationary and it often appears to have an abrupt wall-like edge.

The umbilicus is rather wide, with an abrupt edge.

I went outside to take a look, knowing what I'd find: an abrupt edge ten paces from the exit, with the fog swirling around it.

The glare on the horizon was so bright that she nearly missed the abrupt edge of the plateau.

Or that there was an abrupt edge of things, as some warned.

The snow was built up three feet high, and there was an abrupt edge where the previous day's high tide had eaten away at it.

It seemed a bit lighter now, and the abrupt edge of the snow showed the high-tide line.

How abrupt the edge is became clear on the road back up to the lodge.

The river arrived with great force at the abrupt edge of the obstruction, bringing with it all kinds of trash and large floating islands.

And at the larger end, an abrupt edge framing a concave face that rippled in iridescent silver.