How else do you warn people they're about to enter Wyoming?

Firewatch towers, but what I meant was that if you want solitude, Wyoming is a good choice.

Of course you need lighthouses at the coast of Wyoming, also called 'The Great Rectangular Sea'. The lighthouses of this sea are so good that there have barely ever been any casualties in this sea. However, because of Dutch migration to this sea, parts of it have been colonised (ingepolderd), meaning that new lighthouses at the new coastline have been built.