Ajustando las capas de trabajo

HTML

<script src="https://sitna.navarra.es/api/dev/"></script>
<div id="mapa"></div>

JavaScript

const myMap = new SITNA.Map("mapa", {
  baseLayers: [
    SITNA.Consts.layer.MAPBOX_SATELLITE,
    SITNA.Consts.layer.MAPBOX_STREETS,
    SITNA.Consts.layer.CARTO_LIGHT,
    SITNA.Consts.layer.CARTO_DARK
  ],
  crs: "EPSG:3857",
  initialExtent: [-8916022, 3179736, 9869141, 11789603],
  workLayers: [{
    id: "paises",
    type: SITNA.Consts.layerType.WMS,
    url: "https://bio.discomap.eea.europa.eu/arcgis/services/Internal/Basemap_EEA38_WM/MapServer/WMSServer",
    // Dejamos solamente la capa de fronteras del servicio
    layerNames: ["3"],
    // Le ponemos un título a la capa
    title: "Países del mundo"
  }]
});