There are dams all around the country, guarding all main river estuaries and sea inlets.
Just before Christmas the unseasonably heavy rains near Malindi town washed a family of hippopotamuses down the Sabaki River and out to sea.
He was surprised to find that most salmon do not die as they leave the river and enter the sea, as previously believed.
Flood water is pumped into the River Tone then carried to the River Parrett and into the sea.
Local attractions include zip lines, cave and river tubing, scuba diving, jet skis and deep sea fishing.
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Last season the River Erriff yielded 320 salmon and 284 sea trout.
The spawning habits of the eel is the exact opposite of the other migratory river users - the salmon and the sea-trout which migrate upstream to spawn.
These changes are making water supply and quality more difficult to obtain, affecting runoff and soil moisture, increasing water temperatures, decreasing snowpack and lake and river ice, threatening fish and aquatic species, and allowing saltwater intrusion and sea level rise.
Anglers say they continue to have concerns about the impact of the Tees Barrage on stocks of salmon and sea trout in the river.
When talking about Palestine, the speaker is referring to the region between the Mediterranean Sea and the Jordan River that includes the Jewish state of Israel and the Palestinian lands of the West Bank and Gaza.
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He defines Asia broadly, as bordering with Europe at the Aegean Sea and Africa at the River Nile.
The Environment Agency wants to maintain defences along the River Ouse and coastline between Newhaven and Seaford as sea levels rise.
People traveled waters alternately treacherous and lazy on all sorts of flatboats, dodging snags and pirates amidst a sea of river traffic.
In East Sussex, the EA wants to maintain defences along the River Ouse and coastline between Newhaven and Seaford as sea levels rise.
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Then the second phase: Discovery, where we push a little more and venture out more into the world: exercises classes prepare the body and the mind for such activities as river or sea kayaking, boogie or surf, zip-lining, stand-up paddle, to go beyond our fears.
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He thinks, if you were born in Putney, you saw the river every day, and imagined it widening out to the sea.
And along the mountain river in Olympos that falls into the sea, there are remains of Roman baths from the 5th Century BC.
The survivors floated down the Amur, wintered at the river's mouth and in the spring turned north into the Sea of Okhotsk.
The flow from the source of the Pearl River, which empties into the South China Sea near Hong Kong and Macau, has been reduced to a trickle from a waterfall.
They realised the town was also very badly affected - canal meets river meets sea situation - My brother began a very bad asthma attack and eventually after paramedics helped him they were escorted through flood waters so they could walk home.
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Near Glynde, I crossed the Ouse: the river mucky-banked, beginning to loop as it neared its floodplain and the sea.
New Orleans sits mostly below sea level on swampland on the east bank of the Mississippi River and south of Lake Pontchartrain.
The young eels, called glass eels when they are at sea, are then carried by the Gulf Stream and reach river systems across Europe.
Tonnes of cyanide residue poured from a Romanian gold mine into the Tisza river in Romania, and were then washed into the Danube and finally the Black Sea.
This river and rain runoff, combined with strong onshore winds, has led to high levels of sea pollution.
South of the Sea of Galilee, the Jordan River Valley has gorgeous views of the Galilee Mountains and is truly one of the most beautiful parts of the country.
The dramatic Hollyford Track starts in the midst of lowland forest, crossing mountain streams and passing pretty waterfalls as it follows the broad Hollyford River valley all the way to the sea at Martins Bay.
An extension of the Forth and Clyde Canal is also being built, along with a new sea lock on the River Carron.
Part of the somewhat neglected southern stretch of Kafue National Park, though, is dominated by Lake Itezhi-Tezhi, an inland sea created by the dammed Kafue River that has given rise to superbly scenic, land- and water-based wildlife-watching experiences.
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