[Douglas G. Brown]

Hereabouts, low, relatively flat land alongside a river is sometimes called an intervale. Usually it is farmland. (What people to the south and west of here call "bottomland".)

Farmington, Maine lies partly on an intervale of the Sandy River. Where it is on each side of the river, it is pluralized as "intervales". I never have heard "vale" used alone, by the way. Farmington also is the home of University of Maine at Farmington, where (mostly non - metrical) poets abound. They probably know more about this than I do.

On the coast, where I live, we just say valley. I never heard the word intervale until I first visited a friend of mine who lives near Farmington.
I suspect that there are other localities that still used intervale and vale, despite their archaic sound.

Otherwise, I agree with Eric.