The full extent of the Ringló Vale is not absolutely clear. The upper course of Ringló ran southwestward through a very distinct valley in the White Mountains, but after it was joined by Ciril about halfway along its length, the river flowed into more open land. The Ringló Vale may have encompassed the entire length of the river, or might have been restricted to the deep valley of its upper course. The rivers Ciril and Morthond each joined Ringló southward of the mouth of its deep valley, and the port of Edhellond lay at the river's mouths, far from its mountain sources. It is therefore difficult to say whether these features belonged to the Ringló Vale in the fullest sense, or where merely associated with the lower course of the river.

Tolkien does offer a (rather broad) explanation in his expanded index to The Lord of the Rings, where he defines the Vale as the 'land about the Ringló'. This is perhaps a little vague to be taken conclusively, but it does seem to imply that the Ringló Vale ran all the way along the river's course as far as its mouths on the Bay of Belfalas.