---
title: "Highlight a national boundary | Guides | Map design"
description: "Learn how to highlight specific country national boundaries."
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Highlight a national boundary

You can **highlight a specific country’s national boundary** in any map style that uses the MapTiler Planet tileset, thanks to attributes in its `boundary` layer.

In the filters, you can use the ISO A3 values of the country (e.g. CHE, FRA, CZE, …). You can also find the required value in the Inspect mode (top right corner - change from Map to Inspect).

## Steps

Click the button **Customize a copy.**

Duplicate the **Country border** layer, and rename it “Switzerland,” move it below Country border layer.

![swiss\_2.png](./19484854628497_1d378f3077.webp)

Switch to the **Data view** (bottom left) and add 2 new filters by clicking the **plus sign.**

![swiss\_3.png](./19484854635665_59009547af.webp)

The 1st filter is “adm0\_l == CHE”; the filter logic is set to “Any”, only the “CHE” value applies.

![swiss\_4.png](./19484854639249_b37d6d3be8.webp)

The 2nd filter is “adm0\_r == CHE”; the filter logic is set to “Any”, only the “CHE” value applies.

![swiss\_5.png](./19484841093393_830afb890a.webp)

Set the zoom range styling settings accordingly: 1-1px, 5-3px, 10-5px.

![swiss\_6.png](./19484841095441_f06dfcbb1c.webp)

[Save and publish your map](https://docs.maptiler.com/guides/map-design/how-to-publish-a-map/).