The 20th anniversary is a milestone that marks the completion of two decades. In this crossword, the solutions for the term 20th Anniversary are China (5 letters) and IRAN (4 letters). China is a country located in East Asia with a population of over 1.4 billion people. It is the world's most populous country and the second largest economy. IRAN is a country located in the Middle East with a population of over 81 million people. It is the 18th most populous country in the world and has the second largest economy in the Middle East.