A little video demo of how the Catan border tiles lock in the game board and really keep it stable.
I’m selling these as the standard 4 player sets or the 5-6 player extension sets. The Standard set has 19 terrain tiles and 6 sea borders. The 5-6 player adds 11 terrain tiles and 4 sea border extensions. Find them on Etsy at https://www.etsy.com/shop/LeviathanHouse or contact me here.