IacopoC

<?php
    // Retrieve sites ID and path in WP multisite
$current_id = get_current_blog_id();
     
$args = array('site__not_in' => $current_id);
       
$network_sites = get_sites($args);

        foreach($network_sites as $network_site) {
            echo $network_site->blog_id;

IacopoC

// Demo: http://jsfiddle.net/xuyp8qb5/
// Note: You need Google Map API Key to run demo; bit.ly/2pBgToW

var latlng;
latlng = new google.maps.LatLng(40.730885, -73.997383); // New York, US
//latlng = new google.maps.LatLng(37.990849233935194, 23.738339349999933); // Athens, GR
//latlng = new google.maps.LatLng(48.8567, 2.3508); // Paris, FR
//latlng = new google.maps.LatLng(47.98247572667902, -102.49018710000001); // New Town, US
//latlng = new google.maps.LatLng(35.44448406385493, 50.99001635390618); // Parand, Tehran, IR
//latlng = new google.maps.LatLng(34.66431108560504, 50.89113940078118); // Saveh, Markazi, IR