Some geographical limits that I have reached so far :
 

Waimea Canyon (Hawaii) Waimea Canyon (Hawaii) Lake Assal (Djibouti) Lake Assal (Djibouti) Waiotapu (New Zealand) Waiotapu (New Zealand) Inari (Finland) Inari (Finland) Volcano Taapaca (Chile) Volcano Taapaca (Chile) Ushuaia (Argentina) Ushuaia (Argentina)