Secretary for development Paul Chan and secretary for transport and housing Professor Anthony Cheung discussed the plan, which is one 10 new measures to increase land supply.
The proposal would reclaim a total of 600ha of land outside the harbour, in North Lantau, Lung Kwu Tan in Tuen Mun, Southwest Tsing Yi, and Ma Liu Shui near the estuary of Shing Mun River.
The government is studying an area in the waters between Hong Kong and Lantau Islands, to see whether it is suitable for the proposed artificial island.
Other measures to increase supply include exploring the feasibility of developing a modern new town.
The government is also studying a proposal to relocate three facilities - the Diamond Hill Fresh Water & Salt Water Services Reservoirs, Sai Kung Sewage Treatment Works and Sham Tseng Sewage Treatment Works - to rock caverns.
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