sentences:  There were plans in the 1970s to reclaim land between Singapore and Pulau Ubin to build a large sea reservoir, to increase the country's water supply.This project was similar to Hong Kong's Plover Cove Reservoir project years earlier.However, after reviewing the conditions of the seabed, costs and environmental concerns, as well as complications involving Malaysia, because the closing of the harbour would affect shipment in the nearby Pasir Gudang Port due to the narrowing of the access strait, the plan was eventually scaled down to limited land reclamation off Coney Island and Punggol and the construction of the Serangoon and Punggol Reservoirs which instead lie within mainland Singapore.