Foy's Lake is a man-made lake in Chittagong, Bangladesh. It was created in 1924 by constructing a dam across the stream that came down from the hills in the northern part of Chittagong. The purpose of creating an artificial lake was to provide water to the residence of railway colony. It was named after Mr Foy who was a Railway engineer and believed to materialized the project. Pahartali was basically a railway town with workshop, yard and shed. A good number of railway employees lives there.