Delete All Lava

How do I remove all the lava in the world , for example, there are many bathed in the world , I want to type command and go all the lava how?

for this is better some world editor for PC

Delete it from the world generator. Deleting it by checking block by block is too ineffective.

You could add some rules to pmimporter to do this.

can you help me about this problem? thx xD