WKTLoader

import { MeshNormalMaterial } from 'three';
import { WKTLoader } from 'three-geojson';

// scene, camera and renderer are initialized here

const URL = 'https://raw.githubusercontent.com/gkjohnson/three-geojson/main/example/california.wkt';
const result = await new WKTLoader().loadAsync( URL );

const mesh = result.polygons[ 0 ].getMeshObject( { thickness: 1 } );
mesh.material = new MeshNormalMaterial();
mesh.scale.setScalar( 0.3 );
mesh.rotation.x = - Math.PI / 2;
mesh.position.set( 0, 0, 0 );
scene.add( mesh );