Between the easternmost islet and the land, there is a strait of a league in width.

The tide prevented our trying its depth: a league and a half to the north-west, at high-water, we had irregular soundings between ten and sixteen fathoms, but six fathoms must be deducted from it to reduce it to the depth at low water.
Three leagues to the north-west of Montgomery's westernmost island are COCKELL'S ISLES, two in number, low and flat, but of small size.

A reef extends for more than five miles to the westward, and it was not thought improbable that it might be connected with the reefs that extend to the westward of Montgomery Islands.

The centre of the largest island is in 15 degrees 48 minutes South, and 124 degrees 4 minutes East.

To the North-East of Cockell's Islands the flood-tide sets to the south; but to the westward with great strength to the South-East, and, at an anchorage ten miles to the eastward of Macleay Isles, the tide rose and fell thirty-six feet, the moon being twenty-one days old.