Super altum mare
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
On the high seas.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
On the high sen. Hob. 212; 2 Ld. Raym. 1453.
Defined under Super in Black's Law Dictionary.