Lal Dighi, also called the Tank Square or Dalhousie Square (Bengali pronunciation: [lal diɡʱi]) is a man-made water tank in Kolkata, India.

[clarification needed] Because of the celebration of Holi, which resulted in the pond turning a red or crimson colour, the park became known as Lal Dighi.

[3] Lal Dighi acts as a reservoir to supply water in the BBD Bagh complex.

[2] Lal Dighi is a 25 acres (10 ha) wide body of water in the area of BBD Bagh.

[4] Some of the heritage buildings including Andrew's Church, Writers' Building, High Court, General Post Office are situated nearby to the tank.