Ox-bow Lake – An arc-shaped lake which has been cut off from a meandering river
To learn what an ox-bow lake is, it helps if you know what an ox bow is:
As you can see, an ox bow is a U-shaped piece of wood used as a collar for an ox, the upper parts fastened to its yoke.
So, now you can see that an ox-bow is U-shaped, you can recognise an ox-bow lake, as below:
It will help you further if you know how they are formed:
The outside of the bends are eroded while particles carried by the water are deposited on the insides:
Over time, the bend changes shape:
The river eventually flows through the remaining narrow gap and the land is sealed off by further deposits from the water, leaving behind an ox-bow lake: