Mundok Migratory Bird Reserve lies at the mouth of the Chongchon River on North Korea’s west coast. The river meets the Yellow Sea here, and the tide periodically covers and exposes mudflats. Birds can feed on exposed flats and move to other habitat as the water returns.
Mundok was one of North Korea’s first two Ramsar sites in 2018. It is also recorded by the East Asian–Australasian Flyway Partnership. To understand its importance, look first at what the tide does in a day, then at what a stopover can do for a bird travelling between seasonal habitats.
- The Ramsar list identifies Mundok as site 2342 and gives its area as 3,715 hectares.
- The Flyway Partnership records Mundok Wetland Reserve as EAAF045.
- An estuary, a Ramsar site and a larger proposed heritage property can cover different areas.
Convention on Wetlands — the DPRK’s first Ramsar sites
Choose a reading route
Why mud becomes a feeding ground · Worked example: why two counts might differ · Frequently asked questions
Chapters 1–4 · Understand the landscape
Chapters 5–7 · Work with the evidence
Chapter 1 of 7
Why mud becomes a feeding ground
At low tide, parts of an intertidal flat lie exposed. The surface can look empty from a distance, but small animals can live on it or within the sediment. A shorebird may pick food from the surface or probe below it. The shape of the bird’s bill and its feeding behaviour provide clues about what it can reach.
As the tide rises, the accessible area changes. Birds may keep feeding along the water’s edge, shift to another patch or gather at a place where they can rest above the water. This means the value of a site can depend on a pair of habitats. Food is useful during the feeding window. A nearby resting area can matter when that window closes.
For a classroom diagram, draw the same strip of coastline twice. On one drawing mark an exposed flat. On the other mark the same area under water and identify possible higher ground. Label the two drawings as stages of the tide. The diagram gives you a simple explanation for why a single visit can miss much of what birds do at a wetland.
Convention on Wetlands — the DPRK’s first Ramsar sites
Chapter 2 of 7
What a stopover does during migration
A flyway links places used at different stages of migration. A stopover gives a bird somewhere to rest or restore energy before it continues. A single bird’s route may pass through only some sites in the wider flyway. Different birds can use different routes and timing.
Think of a long trip for which each stop has a different purpose. A bird may arrive with less stored energy than it needs for the next leg. The timing of exposed food and a safe place to rest can influence whether the stop serves its purpose. An abundance of suitable habitat somewhere else on a map says little about whether the bird can reach it at that stage.
The Flyway Partnership’s record helps you place Mundok in a regional network. A network entry is evidence of recognition. To document an individual journey, look for tracking or a marked bird sighted in more than one place. Those observations answer a narrower question about movements.
East Asian–Australasian Flyway Partnership — DPRK site records
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Chapter 3 of 7
Which birds does the evidence describe?
The DPRK’s West Sea tentative submission reports birds such as the Spoon-billed Sandpiper and Black-faced Spoonbill for the wider Chongchon estuary. The source’s scale matters. It gives examples for a broader wetland landscape. It does not place every species in every part of the Ramsar site or establish its presence on a given day.
If you are making a species card, record the English and scientific names as given in the source, then add the location and the date or survey period if supplied. For a conservation category, use a dated assessment for the species. A local count and a global conservation category are separate statements. They can be useful together once both are properly identified.
UNESCO World Heritage Centre — West Sea coastal wetlands tentative submission
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Chapter 4 of 7
Three records and three boundaries
The Ramsar record gives the area and official name of the designated site. The Flyway Partnership uses its own network name and code. The UNESCO Tentative List publication describes a wider proposed West Sea property submitted by the DPRK. Those names can appear in the same search because the records concern related parts of a wetland landscape.
When comparing them, put the designation, publisher and boundary in separate columns. Start a sentence with the name of the relevant area. For example, the 3,715-hectare figure belongs to the Mundok Ramsar site. Using the figure for the whole estuary would shrink the region under discussion and could change the meaning of a later claim about birds.
Ramsar annotated list — DPRK site areas and numbers
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Chapter 5 of 7
Worked example: why two counts might differ
Imagine one group counts birds when the flat is exposed and a second group counts while the tide is high. The first group might see birds spread out over the mud. The second might see a large group gathered at a resting place. A different total could reflect timing and visibility even if the same birds remain in the area.
To compare the surveys, ask for tide stage, time, weather, route and the parts of the reserve that observers could see. If those differ, say so before inferring a change in the population. Repeatable counts give a better basis for comparison because a later group can work under similar conditions and identify any remaining differences.
East Asian–Australasian Flyway Partnership — DPRK site records
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Chapter 6 of 7
Why the river belongs in a story about shorebirds
The tidal flat forms in a setting where the river and the sea meet. Rivers can carry sediment from inland. Tides can move it again, and fine material can settle where the water slows. Over time these processes can change the outline of a channel or the shape of a flat. A Ramsar boundary may stay fixed while those physical features move within it.
To follow this in a map exercise, compare two dated images of the same shoreline. Mark the river channel and the outer edge of visible mud. If the tide was higher in one image, some of the difference in exposed area could come from water level. Repeat the comparison with images taken at comparable tides before drawing a conclusion about lasting shoreline change.
The exercise helps explain why a wetland manager or researcher might care about conditions upstream as well as about the resting and feeding areas themselves. Where sediment comes from is a physical question. Where birds feed on a given tide is a biological one. Studying both makes it easier to ask how a physical change might affect use of the wetland.
UNESCO World Heritage Centre — West Sea coastal wetlands tentative submission
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Chapter 7 of 7
Distinguish a site listing from a bird survey
The Convention on Wetlands announced Mundok as one of the DPRK’s first two sites as the treaty entered into force for the country on 16 May 2018. The annotated Ramsar list gives 16 January 2018 as the site’s designation date. These dates refer to different events. Neither supplies the date of a particular survey or the abundance of a species in a later season.
For a bird survey, ask how observers defined the area and whether they counted each visit separately. A high count during one migration period describes that survey. A long-term trend needs repeated counts or another method suited to tracking change. When sharing a number, put the date, area and method in the same note. A number without those details is difficult to compare with another report.
One final check is to ask whether a count refers to all waterbirds, only shorebirds or one named species. A total for all waterbirds can rise even while a particular species becomes less common. If a report also gives a share of a regional population, identify which population estimate it used. These small details explain why careful counts are more useful than a simple claim that a reserve holds many birds. They also help a reader compare local evidence with the Flyway Partnership’s regional records without confusing the two scales.
Ramsar annotated list — DPRK site areas and numbers
Contents · Previous chapter · Questions
Frequently asked questions
Where is Mundok?
It is at the mouth of the Chongchon River on the west coast of North Korea.
Is Mundok a Ramsar site?
Yes. The Convention on Wetlands records it as site 2342 and identifies it as one of the country’s first two sites.
Why does the tide matter for birds?
It affects when mudflat food is accessible and when birds may need to move to higher resting areas.
Sources and next reading
Primary sources
- Convention on Wetlands — the DPRK’s first Ramsar sites
- Ramsar annotated list — DPRK site areas and numbers
- East Asian–Australasian Flyway Partnership — DPRK site records
- UNESCO World Heritage Centre — West Sea coastal wetlands tentative submission