He is an enormous lizard one hundred meters long who lives in a large swamp. That’s a serious amount of gecko.
He is responsible for thunderstorms and heavy rain. When the monsoon period is imminent, he slurps up large helpings of water and sludge which he squirts up into the sky where it forms into nice juicy thunderclouds.
With a bit of roaring, he sets things in motion and the torrents begin. With a final flourish of lightning flashes, he feels he has done his bit. Then he goes back to basking quietly in the swamp until next season.
Do not disturb him. Intruders will be severely slurped.