Johor, Malaysia (Google Maps ⧉, OpenStreetMap ⧉)

"Johore, Sultan of, ii. 281n, 282n"

"… and the channel (i.e. Rhio Strait) has far more than four paces’ depth of water, whereas there are no more than two fathoms at the western entrance to the Old Singapore Strait. The Old Strait or Selat Tebrau, says N. B. Dennys, Descriptive Dict. of British Malaya, separating Singapore from Johore."