Frontiers between Muscat and Trucial States p.113

FO 371/132797 1958
"From Jebal Mussaya to Jebal Harain a nd thence
eastward crossing the Wadi Qima east of the village of that
name and thence immediately to the east of Jebal Gimh which
should go to Dubai it crosses the Wadi mouths at Hasat al
Ghara and Akbab and Lawshaht and cross the Wadi Wayaya
just to the west of the Sultan's frontier post. From
there the line goes northwards to meet and follow the
watershed of the mountain range between the Wadi Daur and
Hatta, and in the region of Jabal Ghallas it should turn
south to Jebal Mussaya at which point the wall is the
exact boundary."

14)

SHARJAH RAS AL KHAIMAN FRONTIER (Wadi Hilu).

After investigations on behalf of the Political Agent
the following a pproximate boundary was laid down:

The line runs from the Umm al Ghaf Jebal llur aiqin
area along the water shed of the mountain range between
the Wadi Hilu and the Wadis Qaur and Manai to the wall
cutting the Wadi to the south of Jebal Legla'a. Thence north
crossing the Wadi Barid (Ayeile) between Suhaila and
Ladid leaving Ladid to Ras al Khaimah, and continuing
along the water shed of the mountain renge between the Wadis
Mania and Barid on the west and the Wadis Hilu and Shia on
the east."