mud flat

a mud-covered, gently sloping tract of land, alternately covered and left bare by tidal waters.

the muddy, nearly level bed of a dry lake.

Origin of mud flat

First recorded in 1805–15

The tide was going out, and soon a mud-flat would lie between them and the home shore.

Cricket at the Seashore |Elizabeth Westyn Timlow
Probably Sir James did not know that the real Constellation was fast in the mud-flat.

Yankee Ships and Yankee Sailors: Tales of 1812 |James Barnes
The stretch before him resembled nothing so much as mud-flat with the tide out.

Plotting in Pirate Seas |Francis Rolt-Wheeler
There was a heavy log lying on the mud-flat of the river waiting to be shaped into a mast for a boat.

The Hungry Stones And Other Stories |Rabindranath Tagore

And he jumped off the bank and landed lightly on his feet on the mud-flat, and started on again.

The Tale of Peter Mink |Arthur Scott Bailey

mud flat

a tract of low muddy land, esp near an estuary, that is covered at high tide and exposed at low tide

mud flat

[ mŭd ]

Low-lying land consisting of silt or sand that is covered at high tide and exposed at low tide.