Pronounced sloo, it is a swamp or wetland or a side channel or inlet, or a natural channel that is only sporadically filled with water.
We have a lot of those around here in high summer you can walk on them just fine
but throughout the winter and spring one can sink up to ones knees into them and not only loose your shoes but your pants if you are not careful!
We have been very, very wet around here this year.
