The Taedong River runs through Pyongyang and continues southwest towards Nampo, where its lower reaches meet the west coast of North Korea. The West Sea Barrage, also known as the Nampo or Nampho Barrage, crosses the river near its mouth. FAO records its completion in June 1986.
The barrage combines a barrier with gates for water and locks for vessels. Those parts help explain why a single structure appears in discussions of water supply, engineering and navigation. Start with the river through the capital, then follow it to the lower channel and work out what each part of the barrage is designed to do.
- Pyongyang lies upstream of Nampo on the Taedong.
- FAO describes the barrage as roughly eight kilometres long.
- A sluice and a navigation lock control different movements through the structure.
UN Geospatial — map of North Korea
Choose a reading route
Trace the river through the capital · Worked example: separate a feature from its function · Frequently asked questions
Chapters 1–4 · Follow the river
Chapters 5–7 · Work with the evidence
Chapter 1 of 7
Trace the river through the capital
Find Pyongyang on a country map and locate the channel that passes through it. Follow that line southwest to Nampo and the coast. A useful study sketch puts the places in order before adding detail. This stops the name of the capital from standing in for the entire river and gives the coastal infrastructure its own position.
A city river can appear quite different at street level and on a map. A photograph from one bank can show buildings, embankments and a crossing. A map can show where the route leads after it passes those buildings. When reading a claim about urban geography, check whether the evidence concerns a city reach or the river basin as a whole.
An upstream place is defined in relation to the direction of flow. A lower stretch can receive water from tributaries that enter below the city. In a classroom drawing, use arrows and name each place rather than writing “above” or “below” on an unoriented map. That makes the route readable even if the diagram is rotated.
UN Geospatial — map of North Korea
Chapter 2 of 7
What makes a barrage different from a bridge
A bridge gives people, vehicles or trains a route over water. A barrage is built across a waterway to control the movement of water. Some structures can also carry transport across the top. The most useful definition comes from what the structure is designed to do.
FAO describes a main dam, three locks and 36 sluices in its account of the West Sea Barrage. Use those figures as a description of the installation in that source. A more specific question about which gate opened on a particular day would need operational evidence. Historical capacity and current activity are different things to measure.
Make a simple plan drawing. Mark the river side, sea side and barrier. Give the route of water through a gate one arrow and the route of a vessel through a lock another arrow. The drawing should show which passages serve which job, even if it leaves out details of the actual layout.
FAO AQUASTAT — West Sea Barrage in the DPRK profile
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Chapter 3 of 7
How a navigation lock changes water level
A lock uses a chamber with gates to move a vessel between water at different levels. In a general example, a vessel enters at one level and a gate closes. Water is then admitted or released until the chamber level matches the water on the other side. The next gate opens and the vessel can leave.
Draw the chamber twice, first with the lower water level and then with the higher one. Put a gate at each end and mark which is open at each stage. You can now explain the mechanism without needing to know the dimensions of the Nampo locks. Use a site engineering source before assigning particular gate arrangements or dimensions to the real structure.
A sluice is a controlled passage for water. Opening a gate can change how much water moves through, depending on the levels on either side and the position of the gate. This is why descriptions of a barrage mention both water-control gates and navigation locks.
FAO AQUASTAT — West Sea Barrage in the DPRK profile
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Chapter 4 of 7
Why the lower river matters for water supply
FAO’s profile identifies the barrage as supporting irrigation, industrial and municipal uses. This helps explain why it matters beyond the point where it crosses the river. A managed freshwater supply can be connected to users through other infrastructure. The project description gives the uses it was designed to support. Data from a particular period would be needed to say how much water went to each use.
An estuary is a place where river water and seawater meet. A barrier can change that exchange at a particular reach. To study the effects, identify a question first. Salinity, sediment transport and navigation would each require different observations. Give the period and location of any measurements so a reader can tell whether they were taken upstream or on the seaward side.
FAO AQUASTAT — West Sea Barrage in the DPRK profile
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Chapter 5 of 7
Worked example: separate a feature from its function
Write “lock”, “sluice” and “main barrier” on three cards. Give each card a short explanation of its purpose. Put the cards on your sketch and draw an arrow for the movement associated with each. Use a different colour for water movement and vessel movement.
Now add one dated fact from FAO, such as the June 1986 completion. Put that fact beside the source, rather than inside the general diagram of how a lock works. This keeps evidence about the actual project apart from a simplified example of the engineering mechanism.
FAO AQUASTAT — West Sea Barrage in the DPRK profile
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Chapter 6 of 7
Where Nampo fits in the coastal picture
A report on Nampo in the PEMSEA workshop proceedings places the city in the Taedong estuary. Read this beside the country map. The capital, port area and barrage occupy different positions on the route, and the river connects them to the sea. That order gives a geography reader a better starting point than a list of place names.
At a port, geography matters through specific questions about channels, depth, access and connections inland. A national map may identify the port without showing the route a ship takes. A chart or engineering description can help answer a narrower navigation question. If a record describes traffic, check the year and the port area it covers.
An estuary report can also give evidence for a different purpose, such as describing coastal monitoring. Read the author and publication date before applying a statement to present conditions. A project presentation may explain what was planned or being observed when it was written. A dated series of measurements would provide a stronger basis for assessing change.
PEMSEA workshop proceedings — Nampo coastal programme
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Chapter 7 of 7
Make a water-balance sketch
On paper, draw an upstream water body and mark a river flowing into it. Add arrows for water passing through the barrage and for water taken out for other uses. You might also add rainfall and evaporation if you are studying how water levels change over a longer period. The sketch shows where to look for inputs and outputs.
Now ask what you need to put numbers beside the arrows. Flow records can help describe water entering or leaving. A storage record can help explain changes in the amount of water held. Dates matter because the system can look different during heavy runoff and during drier conditions. A list of installed gates does not tell you their operating schedule.
Finally, connect the water-balance drawing to the lock sketch. The lock focuses on the movement of one vessel through changing water levels. The balance sketch focuses on where water goes over a period of time. Both describe the same general kind of structure at different scales. A reader can move between them once the purpose of each picture is clear.
To check your explanation, remove the labels and ask someone to match each drawing to a question. One drawing should help with vessel passage. The other should help with changes in storage. If both appear to answer the same question, add a title identifying the scale and mark the arrows more clearly.
Contents · Previous chapter · Questions
Frequently asked questions
Which river flows through Pyongyang?
The Taedong River flows through Pyongyang.
Where is the West Sea Barrage?
It lies on the lower Taedong near its mouth in the Nampo area.
Why does a barrage have locks?
Locks can let vessels pass between bodies of water at different levels. Water-control gates serve a separate function.
Sources and next reading
Sources
- UN Geospatial — map of North Korea
- FAO AQUASTAT — West Sea Barrage in the DPRK profile
- PEMSEA workshop proceedings — Nampo coastal programme
- NOAA — watersheds explained