NTSC and PAL have no meaning outside of standard def. It's one standard, with uniform size (1920x1080 or 1280x720), and accepts different framerates, whereas PAL is 720x576(?) and 25fps, and NTSC is 720x486 (or 720x480) and 29.97fps.
Region coding is something different entirely. With Blu-Ray, there's three (Regions A, B, and C), with DVD, there are more, and some are PAL while some are NTSC (I don't know if any DVD regions are SECAM).