1.   The treacherous currents have swept away three swimmers in the past year.

2.   There are treacherous underwater currents along this stretch of coast.

3.   The East River has treacherous tidal currents nearly impossible to paddle if you choose to fight them.

4.   The waters there are known for their treacherous currents and dangerous reefs.

5.   Treacherous currents in the bay led ships to hit each other and the bridge over the years.

6.   Mainly local fishermen, they also protect the pilgrims at tourists in the area from treacherous currents.

7.   Problems are less serious in the Dardanelles, a strait that is wider, has less treacherous currents and much less local boat traffic.

8.   Vessels approaching Shanghai are expected to await a pilot into port because of treacherous currents, the tides and extremely heavy traffic in the harbor, he said.

9.   Vessels approaching Shanghai are expected to await a pilot into port because of treacherous currents, the tides and extremely heavy traffic in the harbor.