Hi, I'm Mert. I chose to use a square form in the fire pit design. (13ft by 13ft or 400 cm by 400 cm)
I wanted to design this space below the garden line. In this way, a more private area was created in the garden. I tried to create a barbecue bench and a dining workspace on the new wall that was built.
I hope you like it. İf you want my design, then I can help you with detailed dimensioning and material selection. Enjoy :)