The rocks we were so near running upon were off the northmost isle, which we named the Island of Deceit.
They place it near the northmost of the two curtained columns.
(Um is the same in sound and sense with Ush the dawn, appearing from the eastern ridge of the northmost mountain).
Seymour, as the fast racer, was given the northmost route; Rolf took the middle.
The shorter diagonal, from northmost base of Ziscaberg to southmost of Hradschin, is perhaps a couple of miles.