A rock, awash, with sunken rocks N of it, lies about midway between the entrances to Cedar Passage.
In Aroih Raya, the current reaches its greatest strength along the N coast of Pulau Batee. Vessels must beware of an eddy at ebb tide flowing due S of the SE point of Pulau Peunasoe and a strong current setting in between the W point of Pulau Batee.
Tides rips, at times appearing almost like breakers, form in Aroih Raya and Aroih Cut. They are most violent during the ebb current in the Southwest Monsoon and during the flood in the Northeast Monsoon, that is, with the wind against the current.
In the latter season they are comparatively moderate.
They are sometimes dangerous to small vessels at anchor in the passages.
Directions.—Aroih Raya should be used only by power vessels because of the strong tidal currents.