The title “Rudha Dubh” means something like
Dark Headland
or
Black Point
(from gaelic
Rudha
and also “Rubha”: headland, promontory, point [of land] and
dubh
meaning dark or black - rf. Carmichael et al., 2014,
Gaelic Place Names of Arrochar Parish
).
It remains unclear which “Rudha Dubh” is referred to, because the dance description does not specify a specific one.
There are several places named Rudha Dubh throughout Scotland like on the coast of the Isle of Islay near Lower Killeyan, a small promontory on the north-west corner of Isle of Bute, another on the East cost of the Isle of Tiree, one with a lighthouse built on near Scalasaig on the Isle of Colonsay, or the Black Point jutting into Loch Grunabhat.
A famous one involves the SS Politician which ran aground the cliffs of Rudha Dubh at island of South Uist in the Sound of Eriskay in 1941 with a cargo including 28000 cases of malt whisky. This event gave the inspiration for the novel “Whisky Galore” and the movie “Whisky Galore!”.