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

2) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

3) The Serengeti National Park, located in Tanzania and extending into Kenya, is renowned for its vast savannahs, diverse wildlife, and the annual wildebeest migration. It is a UNESCO World Heritage site and a popular destination for safari enthusiasts and nature lovers.

4) The word "computer" contains three vowels: O, U, and E.