1) The word "forest" contains two vowels: O and E.

2) The Victoria Falls, situated on the Zambezi River between Zambia and Zimbabwe, is one of the largest and most spectacular waterfalls in the world. It is over 1.7 kilometers (1 mile) wide and has a height of 108 meters (354 feet), attracting visitors with its breathtaking beauty and power.

3) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

4) The word "pencil" contains two vowels: E and I.