Askja is a word in Icelandic that translates to "caldera" in English. Askja is derived from the Icelandic word "askur", meaning ash, and "ey", meaning island. Caldera, on the other hand, is a Spanish word used to describe a large volcanic depression formed by a collapsed magma chamber. Other synonyms for askja include crater, cauldron, pit, hollow, depression, and basin. These words describe geological formations that are similar to askja, with the main difference being their origin, size, and shape. Regardless of which word you use, they all describe awe-inspiring natural wonders that are both mysterious and beautiful.