Definition of "harborough"

[...] having upon sea borde greate sandes, which do make the harborough good, and bytwene the londing place and the towne is, at the leste, 40 score tayloures yardes, [...]

1545, a letter from the Duke of Norfolk to King Hebry VIII, printed in 1830, in State Papers: Published Under the Authority of His Majesty's [Great British Record] Commission: King Henry the Eighth, chapter CCX, page 782

[T]here aboutes dwelt greate multitudes of people half wilde, hiding thẽſelues in caues of the grounde, of ſmall ſtature, and very fearefull, for as ſoone as they ſawe them they fled into their holes, and that there was a great riuer and very good harborough.

1582, R[ichard] H[akluyt], compiler, “The Discouerie of the Isles of Frisland, Iseland, Engroueland, Estotiland, Drogeo and Icaria, Made by M. Nicolas Zeno, Knight, and M. Antonio His Brother”, in Divers Voyages Touching the Discouerie of America, and the Ilands adiacent vnto the Same, […], London: […] [Thomas Dawson] for Thomas Woodcocke, […]

For all the sea coastes are ful of clear and glistering stones, & alabaster, and therefore it is full of good havens and harboroughs for ships.

1600, Richard Hakluyt, translator and editor, “The relation of John de Verrazano a Florentine, of the land by him discovered in the name of his Majestie. Written in Diepe the eight of July, 1524”, in The principal navigations, voyages, traffiques & discoveries of the English nation, J. MacLehose and sons, published 1904, page 438