2 adjectives to describe friths

He finds his fellow guilty of a skin Not coloured like his own, and, having power T' enforce the wrong, for such a worthy cause Dooms and devotes him as his lawful prey, Lands intersected by a narrow frith.

Regarded as water, it is like a pond with half a dozen broad rounded promontories extending nearly to its middle, half from each side, while its watery bays extend far inland, like sharp friths, at each of whose heads several fine streams empty in,almost a leafy archipelago.

2 adjectives to describe  friths