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Helsinki Convention on the Protection and Use of Transboundary Watercourses and International Lakes

Denmark
With reservation of application to the Faroe Islands and Greenland.
Netherlands (Kingdom of the)
For the Kingdom in Europe.
Portugal
On 28 June 1999, the Government of Portugal informed the Secretary-General that the Convention would also apply to Macau.
(On 18 November 1999, the Secretary-General received from the Government of Portugal, the following communication:
"In accordance with the Joint Declaration of the Government of the Portuguese Republic and the Government of the People’s Republic of China on the Question of Macau signed on 13 April 1987, the Portuguese Republic will continue to have international responsibility for Macau until 19 December 1999 and from that date onwards the People’s Republic of China will resume the exercise of sovereignty over Macau with effect from 20 December 1999.
From 20 December 1999 onwards the Portuguese Republic will cease to be responsible for the international rights and obligations arising from the application of [Conventions] to Macau.")