Definition of "perilous"

Three miles or more to our starboard is a low dim line. It is the Eastern shore of Central Africa. We are running to the southward, before the North East Monsoon, between the mainland and the reef that for hundreds of miles fringes this perilous coast.

1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887