The General Secretariat of the Organization of American States consists of six secretariats. Environmental treaties are applied with the help of secretariats. The districts of the Sri Lanka are divided into administrative subunits known as divisional secretariats. Central Province is divided into three districts and 36 divisional secretariats. The districts of the Sri Lanka are divided into administrative sub-units known as divisional secretariats. Professional bodies, including international organizations, state governments and secretariats may use their own definitions. Southern Province is divided into 3 districts and 47 divisional secretariats. The federation had numerous affiliated trade secretariats, which changed over time. The districts of Sri Lanka are divided into administrative sub-units known as "divisional secretariats". There are national secretariats (hosted by public administrations or hiking associations) in each country. There are 26 divisional secretariats divided in Uva Province, which are listed below, by district. There are 36 divisional secretariats divided in Central Province, which are listed below, by district. There are 28 divisional secretariats divided in Sabaragamuwa Province, which are listed below, by district. There are 40 divisional secretariats divided in Western Province, which are listed below, by district. There are 36 divisional secretariats in Central Province, which are listed below, by district.