Country Boundary Downloader
Choose from the available country list and retrieve the first polygon returned by Nominatim. Check its match and coverage before downloading; the spherical area estimate is not official land area.
By Aryan Khan, Founder & Editor · Updated October 2026
The returned OSM outline may contain multiple polygon parts; check the match and coverage.
How to use Country Boundary Downloader
Choose a listed country and check the match:
Choose one of the listed countries to retrieve the first polygon match from Nominatim, download its geometry, and see an approximate spherical area. This is not an official land-area figure.
- 1Choose the country.
- 2Press “Get the boundary”.
- 3Download KML or GeoJSON.
What people use Country Boundary Downloader for
1. Teaching and publishing maps
Use the matched outline for a map or report after checking its source and geographic coverage.
2. GIS clipping and masking
Clip global datasets to one country, or mask everything outside it. The boundary file is the cookie cutter; your data is the dough.
3. Web map backdrops
Country-highlight maps (pickers, coverage graphics, election explainers) start from the outline — the Boundary KML Downloader covers the cities and counties below this level.
4. Area verification
The computed enclosed area lets you sanity-check published country areas — outline-derived figures and almanac figures should broadly agree, and the differences are instructive.
Worked examples
Some returned country features contain several polygon parts. Inspect the matched feature before using the download.
Detached parts or holes depend on the specific geometry returned by Nominatim.
What the file contains
The anatomy of a country download.
| Element | In KML | In GeoJSON |
|---|---|---|
| National outline | Placemark with MultiGeometry | Feature with MultiPolygon |
| Island parts | Additional Polygons in the same Placemark | Additional polygon arrays in the same geometry |
| Coordinates | lon,lat tuples | [lon, lat] pairs, WGS84 |
| Computed area | Shown with the download | Same figure, from the outline |
The approximate spherical area includes the returned outline, which may include water. It is not an official land-area measurement; disputed borders follow OSM mapping.
How to interpret the result
The most common errors come from using a correct result to answer the wrong geographic question. Keep these points in mind for Country Boundary Downloader:
- Keep the original file even after converting: GPX→GeoJSON drops timestamps' context, KML→GeoJSON drops styling, and every pipeline has a lossy edge. Originals are cheap; re-acquisition is not.
- Validate before trusting exports from unfamiliar tools — open them in a local viewer and check feature counts, bounding boxes and a few property rows. A wrong-axis or swapped-coordinate export is far easier to catch on a map than in a spreadsheet.
Limits & appropriate use
File formats support different combinations of geometry, timestamps, properties and styling. Converting between them can lose information, so keep the original and inspect the output before sharing or using it.
Capabilities differ by workspace: check the accepted format and the operations actually offered on this page. Some tools process files locally but may request map tiles or other services over the network; large or specialised datasets may require dedicated GIS software.
- Cadastral/legal formats → jurisdictional land-registry exports.
- Point clouds and rasters → desktop GIS with proper spatial indexes.
- Certified tracks (evidence, insurance) → chain-of-custody originals, untouched.
Data & methodology
Nominatim polygon retrieval for the country feature plus spherical area summation across all polygon parts.
For source details, licences and model limitations, see Data Sources and Methodology.
Key terms worth knowing
- GeoJSON
- JSON geographic format; the web-mapping native dialect.
- KML
- XML format from the Google Earth era, with styling and ExtendedData.
Editorial guidance: MapBench explains the method and limitations so the tool can be used as a transparent reference, not as a black-box answer. For legal boundaries, safety-critical routing, surveying, engineering, regulated decisions or official statistics, verify the result with the responsible authority or a qualified professional.
Category: Map Files. Results are intended for everyday analysis and planning unless a page explicitly states otherwise.
Method, assumptions & limits
- This tool’s method
- Nominatim polygon retrieval for the country feature plus spherical area summation across all polygon parts.
- Before relying on the answer
- Inspect the accepted file format and the fields reported by this specific tool. Keep a copy of the original file before converting or editing it.
- What the result cannot establish
- File geometry and recorded timestamps can be incomplete. Verify row or point counts and inspect the exported file in your target application.
Coverage: Worldwide. Search, basemap and external data requests may use third-party services; browser-based does not mean every operation is offline. Read the source and licence notes, calculation methodology and privacy policy. If a result looks inconsistent, report a correction with the inputs and mode used.
Frequently asked questions
Clear answers about the calculation, accuracy and appropriate use.
Are islands included?
The export contains the polygon parts returned by Nominatim for the matched feature, but coverage and completeness are not guaranteed.
Whose borders are these?
OpenStreetMap's community mapping; disputed areas follow OSM's on-the-ground rule.
Is my uploaded map file sent to a server?
Where a page says browser-first or local processing, the file is handled in your browser. Check the individual tool note for any external-service dependency.
What should I do if a file will not load?
Check that the file type is supported, the structure is valid and the file is within the stated size limits. Converting to GeoJSON, GPX, KML or CSV can also help.
Will converting a file preserve every property?
Not always. Geographic formats support different geometry, style and metadata features, so inspect the output before relying on it.
Which countries are available?
The selector has a fixed list of 24 countries, not every country. A polygon match is not guaranteed.
Are overseas territories included?
Coverage follows the returned feature; verify whether a territory is included independently.
KML or GeoJSON?
KML for Google Earth and sharing; GeoJSON for GIS, web maps and code. Same outline in both — choose by destination, not by data.
Why is the file so large?
Coastlines are fractal in spirit: detailed countries carry hundreds of thousands of outline points. Size is fidelity. Simplify in your GIS if your use allows it.
Can I get just one island or region?
Use the Boundary KML Downloader for sub-national outlines — provinces, states and islands with their own administrative records live there.
Are enclaves handled?
Holes in the returned polygon geometry are exported, but their presence depends on the matched OSM record.
Whose borders for disputed areas?
OpenStreetMap’s documented position, as with all boundary data here. The file is a working geometry, not a diplomatic ruling.
Related tools and resources
Below country level: the Boundary KML Downloader; measure a file: the GeoJSON Area Calculator; inspect structure: the GeoJSON Geometry Type Counter.
More free tools
Sources, methodology & editorial trust
- ✓ Browser-first processing where supported
- ✓ External sources are documented
- ✓ No account required for public tools
- ✓ Review data sources
Calculations are documented with their assumptions, limitations and source context rather than presented as unexplained answers.
Reviewed and maintained by Aryan Khan, Founder & Editor of MapBench.
Part of our gis files hub
Country Boundary Downloader sits in the gis files cluster, alongside 64 other tools that answer neighbouring questions with different methods or datasets.
You may also need
When this answer is only part of the job, these clusters cover the next step.
Read the guide behind this tool
KML vs. GeoJSON vs. GPX: Choosing the Right Map File Format — The practical differences between three common geographic file formats — when to use each, what can be lost in conversion, and how to move between them.