The Han River of Seoul

High in the Taebaek Mountains, on a peak called Geumdae, there is a trickle of water so small that stepping across it would not even wet a whole foot.

That is where the Han River begins.

From that peak the water runs downhill, gathers in other streams, and becomes a real river. But it is not the only water that makes the Han. In mountains far to the north, another river is running down too. The two take very long, separate paths before they meet.

The water from Geumdae is the southern branch, called the Namhan, the South Han. The water from the north is called the Bukhan, the North Han.

The North Han is the very stream that made Nami Island. When people blocked it with the Cheongpyeong Dam, the water rose, and a piece of land in the middle of the stream became a true island. So the rows of trees that visitors line up to photograph today stand there thanks to this branch of the river.

The two names sound complicated, but their meaning is easy to remember. One is the southern Han, the other is the northern Han, and Han is the name the whole river shares. In other words, people long ago named the branches just the way a child would: the lower one and the upper one.

The two branches meet at Yangpyeong, in Gyeonggi Province. From that meeting point on, they give up their separate names and become one stream, the Han River. There is something lovely about the place where the two waters touch. Water from two mountain regions far apart flows hundreds of kilometers in two quite different directions. In the end it finds its way to exactly one spot, to travel the rest of the way together.

The name sounds very plain, and it truly is. In old Korean, the word "han" simply meant big. And "garam" meant river. Put them together and they make "big river." People long ago looked at the wide water flowing past them and called it the big river, with nothing added.

Before that name became the standard, the river carried other names. Arisu. Daesu. Ungniha. Each age had its own name for it, like a person known by several names to several generations of neighbors.

Then the river enters Seoul.

This is the stretch that anyone who comes to Korea crosses at least once, usually in a car or a bus, usually while dozing off. Within the city, the river is more than one kilometer wide. It is so wide that people standing on the far bank look like small dots.

A stretch of water that wide, cutting across a big city, raises a very practical problem: how to get to the other side.

Seoul's answer was bridges, a great many of them. In the capital area alone, 31 bridges cross the Han River. And that is not all. The subway crosses the river at 11 more places. So every day, millions of people pass back and forth above that water, and most of them never have time to look down.

Koreans have a phrase they often use for the years when their country went from deep poverty to where it stands today: the Miracle on the Han River. They borrowed the river's name for a whole era. The river did not make it happen. But it all happened right along its two banks, where everyone could see it.

Today both banks are lined with long stretches of grass. People from the city come there to jog, to cycle, to spread out a mat and lie down, and in summer to fly kites. Many people sit and eat a hot bowl of instant noodles right by the river in the evening. The great river of the old capital has become a shared backyard for several million people.

From Seoul, the water keeps flowing west and empties into the Yellow Sea, near the demilitarized zone that lies between the two halves of the peninsula. Altogether, that whole journey runs about 514 kilometers, counted from the little trickle on the peak of Geumdae.

And here there is a curious coincidence that Vietnamese travelers in particular will notice.

A traveler flying to Seoul from Da Nang leaves behind a city whose own river is called the Hàn. That river also runs through the heart of town, it also has many bridges across it, and there too people come to sit by the water in the evening breeze.

To be clear, these are two entirely different rivers in two different countries. The names only happen to look the same when written in Vietnamese. They are not related in any way.

Still, the coincidence leaves something to think about. At the two ends of a flight of more than four hours, two cities have grown in the same way. Each chose a river as its spine and slowly spread out along both banks. Each joined the banks with bridges. And each made the river itself the place where people meet in the evening.

So on the ride from the airport into the city, the road may cross a bridge over a wide stretch of water lit up below. That is the moment not to fall back asleep. Lower the window, look out for a while, and count how many other bridges can be seen from that spot.