Vergreen type forests are found in the equatorial region. This region is characterized by a tropical climate with high temperatures and abundant rainfall throughout the year. The constant warmth and moisture create ideal conditions for the growth of evergreen forests.

Option 1, Mediterranean region, does not have a tropical climate but rather a Mediterranean climate with distinct wet winters and dry summers. It is not a suitable environment for evergreen forests.

Option 2, monsoon climatic area, can have evergreen forests in some parts, but it is not a universal characteristic of all monsoon regions.

Option 3, desert regions, are known for arid conditions and lack of vegetation, making it an unsuitable environment for evergreen forests.

Therefore, the correct answer is option 4, equatorial region, due to its tropical climate and favorable conditions for evergreen forests.