The Hong Kong Disneyland Resort is a resort built and owned by a joint venture of the Government of Hong Kong and The Walt Disney Company in Hong Kong at the northeastern tip of Lantau Island. The resort contains theme park, hotels, and several retail, dining and entertainment facilities. Disney Explorers Lodge is the biggest hotel in the resort and opened on April 30, 2017. It is a 750-room exploration themed hotel with four themed areas. Everdure Caltite System has been specified by Walt Disney Imagineering for the waterproofing in the base and wall of water tank for potable water, for long-term reliable protection.