I had to look at the source to find the possible options. In 906d40b.js starting at line 3471 (could change in the future) is an array of possible values. You can search for the embed url of the iframe to get the country name.

It looks like

  [
    {
      title: 'Australia',
      link: 'https://www.google.com/maps/@-25.350684,131.0463223,3a,7...',
      embed: 'https://www.google.com/maps/embed?pb=!4v1686332510022!6m8!1m7...'
    },
    {
      title: 'Austria',
      link: 'url',
      embed: 'url'
    },
    ...
  ]