The Ta' Kandja galleries are a system of tunnels in the limestone beneath the island nation of Malta which collect freshwater for domestic and agricultural use. The galleries collect water from an underground lens of fresh water which floats on the salt water which underlies the island. Increased summer tourism and the prospect of rising sea levels pose problems.
The galleries, which are accessible via lift, may be toured on Fridays by making reservations 2 weeks in advance. Tours are also available to the Pembroke Reverse Osmosis Plant and the Institute of Water Technology (Malta), other facilities operated by the Water Services Corporation (Malta).