# Map Layer Reference
A map layer renders geospatial data on a map. Use the <flow-map-layer> component to
add a layer to a Flo.w RDF map.
The text content of the <flow-map-layer> component is used to specify layer styling properties using a CSS-like language of property/value pairs. For example:
<flow-map-layer type="circle" ...>
circle-color: red;
circle-radius: @prop1 * 10;
</flow-map-layer>
Property values are specified using Flo.w reactive expressions that can access map feature properties and reactive application state.
The following layer types are supported:
- Circle - filled circles.
- Fill Extrusion - 3D polygons.
- Fill - filled polygons.
- Line - styled lines.
- Symbol - text and icons.