See more on World Water Day here.
The rally comes amidst protests by Tamils in Jaffna in recent months demanding the Sri Lankan government provide safe drinking water. Contamination of drinking water continues to be an issue in the North-East, with schoolchildren hospitalised after water poisoning last year.
The crisis has also affected hospitals in the region, with the head of Poonakari hospital having to seek permission from the Sri Lankan military in order to access drinking water, from the previous hospital grounds which are now being occupied by the military.