The indicator refers to the number of parties (=countries that have ratified, accepted, approved or accessed), to The Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and their Disposal (Basel Convention); Data has been received from the Basel Convention. Metadata: https://environmentlive.unep.org/indicator/index/12_4_1, https://unstats.un.org/sdgs/metadata/files/Metadata-12-04-01.pdf