Banganga is a medieval water tank situated in Malabar Hills, Mumbai and is within the Walkeshwar Temple Complex. Legend has it that during his pursuit of Ravan, Lord Ram paused here for he was overcome with thirst and fatigue. To satiate his need Lakshman shot a 'Baan' (arrow) in the ground, and a gush of water poured out, creating a tributary of the Ganga. Hence, the name Banganga.The ancient Shivling at Walkeshwar Temple is said to have been installed by Lord Ram himself, made up of sand and hence, the origin of the name Valuka Ishwar (idol made up of sand).The tank was later on built in the 12th century by a minister in the Silhara dynasty and what is most unique is that the water of this tank is sweet, despite being very close to the salty Arabian Sea.