In
Quang Ninh, there are numerous rivers and springs, but most are
short and small, and feature currents that differ between seasons.
In
winter, most rivers run dry, but in summer, waterfalls pick up
fast currents. The water current reaches 1.45 cub. m/s in dry
season, but up to 1,500 cub. m/s in the rainy season.
Quang
Ninh’s sea borders upon the Gulf of Bắc Bộ. It is
large and protected by the ranks of islands, so the wind is
quieter and the water smoother. The gulf’s current runs from
north to south. It is Vietnam’s coldest sea, with the
temperature sometimes dipping below 13ºC.
