In the guidelines, it is explained in point 18 regarding the use of hashtags.

• Use tags wisely.
  Good tag use helps your post get found. At a basic level you can use...
  #typeofplace #city #country #steem-atlas (eg #museum #paris #france #steem-atlas)

• These are the guidelines for using place descriptions in the Steem Atlas.
  Use the name of the place, and general location, in the Pin Description.
  Generally you shouldn't need the whole post title in the Pin Description.

Hope it can help for the next post.🙏🏻🙏🏻