Credit: Ajith Kumara (SriLanka)

This photograph was taken in Mannar area, North province in 2009 (Mannar District is one of the 25 districts of SriLanka). The water body is a part of lagoon (tidal flat) during low tide. People shown in the photo dig holes to catch Scylla serrata  (mud crab or mangrove crab). According to outer opening of the tunnel fishermen get a good idea on the size of the crab.