Fortran: End Do vs. Continue
In addition to Mark44's reply, "ye' Old Days" also allow us to end our loops with a line labels (ie, line number) attached to an executable statement - yuch.
Better practice suggested (although didn't require) using a continue statement with, of course, an attached line label.
The use of the "END DO" does not require a line labels and is more inuitive to program structure while reading the code. (all those CONTINUEs tended, at times, to get muddled).