How do I kill the player in Minecraft when they enter a specific area (-131 5 236 to -122 5 227)?

Solution 1:

You can use the command /kill @a[x=-131,y=5,z=227,dx=9,dy=0,dz=9] in a repeating command block. Mcstacker is a great resource for advanced command generation. You can read more about the volume selector here.