It is the tidal flat at Taiwan Strait. It is also an oyster farm area. The ox cart was heading to the oyster farm.
Tidal flat is muddy or marshy land that is covered and uncovered by the rise and fall of tides. It is essentially horizontal.
Tranquility before the storm.
這是台灣海峽的海埔地。 這也是牡蠣養殖場。 牛車正往牡蠣養殖場去。