Query get_posts by level depth

You’ll need to run two queries here

• First query we will be returning all top level pages (I assume Asia, Africa and America is top level pages)

• Second query we will get all direct children of the top level pages returned

You can try something like the following:

$parent_id_args = [
    'post_parent'    => 0, // Get all top level pages
    'post_type'      => 'page', // Change if this is a hierarchical custom post type
    'posts_per_page' => -1, // Get all pages
    'fields'         => 'ids', // Only get ID's
    // Add any additional parameters
];
$parent_ids = get_posts( $parent_id_args );

//Make sure we have pages
if ( $parent_ids ) {
    $args = [
        'post_type'       => 'page', // Change according to correct post type
        'posts_per_page'  => -1,
        'post_parent__in' => $parent_ids, // Get child pages from these parent
        // Any additional arguments
    ];
    $q = get_posts( $args );
    if ( $q ) {
        foreach ( $q as $post ) {
            setup_postdata( $post );

            the_title();

        }
        wp_reset_postdata();
    }
}