They noted that the rock marked the eastern extent of the tidal influence in the Columbia.

By 1942, the slough had begun to isolate from tidal influences.

Known as anchialine habitats, they are pools some distance away from the sea but which still maintain tidal influence.

The tidal influence was the perfect way to move goods without much human or animal effort.

Due to tidal influence, this activity is not often needed.

The lower portion of the river up to 6 km from the sea, is subject to tidal influences.

Key features of flow behaviour are tidal influences and salt water intrusion.

The point is that if these guys are right, it's not just the tidal influence from the sun we've got to take into account.

The tidal influence reaches 15km inland from the sea, at Bilbao's old town.

This section of the river is subject to tidal influence and the usable basin area therefore varies with the tide.