var marumap = L.map("marumap").setView([38.891, 139.824],16);
     
    var osm =
        L.tileLayer('//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
          attribution:
          '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> \
    contributors'
        }).addTo(marumap);