List of countries engaged in IESO:
Argentina
Australia
Austria, www.asi.edu.au
Austria
Belarus
Bangladesh, www.byei.org/neo
Brazil, www.obap.agr.br
Cambodia
China
Czech Republic, www.zemepisnaolympiada.cz
Germany, www.die-deutsche-olympiade-der-geowissenschaften.de
Estonia
Finland
France
Haiti
India, www.geosocindia.org/
Indonesia, http://www.toiki.or.id/
Israel
Italy, http://olimpiadi.anisn.it/ieso/
Japan, http://jeso.jp/index.html
Kazakhstan, http://zhas-geolog.kz/olympics/
Kazakhstan
Kuwait
Lithuania
Malawi
Malaysia, http://myeso.com.my/
Nepal
Norway, http://www.geologi.no/geofag/geofag-ol
Pakistan
Philippines
Romania
Russia
South Korea
Spain, Olimpiada Espanola de Geologia website
Sri Lanka,
Taiwan, http://www.ieso.cc/
Thailand,
Ukraine,
USA, USA E.S.O. website