Best Things to Do on a Hummanaya Blowhole Hummanaya Blowhole guide — one of the largest sea blowholes in the world, near Dikwella on Sri Lanka's south coast.
Local claims rank it among the largest sea blowholes anywhere, with jets reportedly reaching significant heights in rough seas.
The blowhole is most dramatic during rougher sea conditions; calm days may produce only a modest spray.
A short walk to a viewing platform overlooking the rock channel where the blowhole forces water skyward.
