Level 1 Studies
   Apennines, Italy
   Austrian Alps
   Central Scandinavian Mountains, Sweden
   Lake Korttajarvi, Central Finland
   Lake Neuchatel, Jura Mountains, Switzerland
   Lake Redon, Central Pyrenees, Northeast Spain
   Lake Toskaljavri, Northern Fenoscandia
   Lake Tsuolbmajavri, Finnish Lapland
   Northern Icelandic Coast
   Northern Icelandic Shelf, North Atlantic Ocean
   Northwest Spain Peat Bog
   Polar Ural Mountains, Russia
   Spannagel Cave, Central Alps, Austria
   Spannagel Cave, Central Alps, Austria
   Swedish Scandes
   Tagus River Estuary, off Lisbon, Portugal
   Voring Plateau, Eastern Norwegian Sea

Level 2 Studies
   Berre Lagoon, Southeast France
   Eastern Gotland Basin, Central Baltic Sea
   European Alps, Switzerland
   Gorner Glacier, Alps of Valais, Switzerland
   Great Aletsch Glacier, Alps of Valais, Switzerland
   Lake Lehmilampi, Eastern Finland
   Lomonosovfonna Ice Core, Svalbard, Norway
   Northern Icelandic Shelf, North Atlantic Ocean
   Oberer Landschitzsee, an Alpine Lake in the Southern Austrian Alps
   Svalbard, Norway
   York, England

Level 3 Studies
   Ashdod Coast, Eastern Mediterranean
   Czech Republic
   Estanya Gran Lake, Pre-Pyrenees, Spain
   Gulf of Taranto, Ionian Sea
   Lake Nautajärvi, Finland
   Las Tablas de Daimiel National Park, South Central Iberian Peninsula, Spain
   Lower Grindelwald Glacier, Bernese Alps, Switzerland
   Marennes-Oléron Bay, France
   Mongan Bog, Central Ireland
   Mt. Storsnasen, Southern Swedish Scandes, Sweden
   Ria de Vigo, Northwest Iberia, Spain
   Russkaya Gavan' Fjord, Novaya Zemlya
   Saki Lake, Crimean Peninsula, Ukraine
   Spain
   Three Estuaries off the Atlantic Coast of France