dncument A/CN. 41274, para. 633; and the 1904 Convention between France and Switzerland for the regulation of fishing in their frontier waters, L&§.ln&.e-IEsxts . . . , Treaty No. 196, p. 701, arts. 6, 11 and 17. l.d!i/ Le.g~l.8LtFu.e ,_.. Taxts . . . , lreaty No. 196, p. 701, art. 17 at. p. 706:. - 153ecosystems of international watercoursa[s] [systems] by protecting the waters thereof against pollution. The 1956 Treaty between the Soviet Union and Afghanistan concerning the regime of the Soviet-Afghan State frontier, for example, provides that “The competent authorities of both Contracting Parties shall take the necessary measures to protect the frontier waters from pollution by acids and waste products and from fouling by any other means. ‘0.J&.6/ And the 1956 Convention concerning the canalisation of the Moselle betwaen the Federal Republic of Qermany, France and Luxembourg provides that the parties “shall take the necessary measures to protect the waters of the Moselle and its tributaries against pollution . ..‘I. m/ (8) The netJ to protect and preserve the ecosystems of international watercourse[e] [systems] is also recognieed in the work of international organisations, conferences ancl meetings, The Act of Asuncib, adopted by the Fourth Meeting of Foreign Ministers of the Plate River Basin Stetes in 1971, m/ refers to the “grave health problems arising from ecological relationships in the geographic area of the River Plate Basin, which have an unfavuurdale impact on the social end economic development of the region”, and notes that “this health syndrome is related to the quality and quantity of the water resources”. J.6.91 The Act also mentions “The need to control water pollution and preserve as far as possible the natural qualities of the water as an integral part of a policy in the conservation and utilisation of the
**Analysis**
The text discusses the importance of protecting the ecosystems of international watercourses, citing various treaties and conventions that aim to prevent pollution and preserve the natural quality of the water. This suggests that the category should be related to natural resources and the environment.

**Category**
Natural resources and environment