Where can i find new maps?

I saw a youtuber (draegast) test machines on maps i haven't seen (and yes ive tried googleing it)

 

Look up Besiege Custom Scene. It's great! Wide variety of wide open spaces, hills, it's wonderful

 

thanks!

 

can you post a link or tell me where to search it I cant find it

 

https://www.dropbox.com/s/5v23a8ybh9poaym/BesiegeCustomScene9.8beta.rar?dl=0

It's where I got it.