The village of Bantantengah lies about midway between Tanjung Jati and Tanjung Parit, the NE end of the island. During May and November numerous fishing boats frequent the waters N of the island.
A shoal, with a depth of 3.9m, lies on a ridge about 7 miles N of Bantantengah.
The E coast of Pulau Bengkalis is fringed by a steep-to bank of mud and sand extending about 0.3 mile offshore. A river discharges into the strait about 2 miles S of Tanjung Senekip, which lies 3.75 miles SSE of Tanjung Parit.
A shoal, with a depth of 8.5m, lies 2.5 miles offshore 4.5 miles SE of Tanjung Senekip.
A shoal, with depths of less than 10m, lies centered 1.5 miles offshore between Tanjung Senekip and Tanjung Pulau Kandar.
The tidal currents set along the N side of Pulau Bengkalis and Pulau Rangsang, to the SE, in an E to ESE direction at a rate of 2 knots at springs, and from W to NW at a rate of 3 knots.
At neaps, both currents are weak off Pulau Bengkalis, but have a rate of from 1 to 1.5 knots off Pulau Rangsang.
In the bight between these two islands, the current sets in and out.
In Selat Bengkalis, the SE current begins about 2 hours after LW along the shore and may attain a rate of more than 2 knots.
The NW current begins 2 hours after HW and at times attains a rate of 3 knots.
The current near the E coast of Pulau Bengkalis has a rate of almost 2 knots and increases to a rate of 3.5 knots near Pulau Belembang and Pulau Burung.
A vessel bound for Bengkalis Settlement from the Strait of Malacca may pass close along the E side of Pulau Bengkalis, round its SE end, taking care to avoid the spit which extends from it, and then proceed through Selat Padang.