Which of the following regions of the globe exhibits highest species diversity?

The Amazon Rainforest is the most species rich terrestrial ecosystem on the planet, with an estimated 16,000 species of trees and more than 40,000 plant species, making it the region with the highest species diversity
on the globe. The Amazon forest is also home to a significant number of animal species, including monkeys, jaguars and river dolphins, as well as a vast array of insect and bird species.
(1) The Western Ghats are a mountain range along the western coast of India, which is home to many endemic
species. It is also a region of high biodiversity, but it is not as biodiverse as the Amazon forest.
(2) Madagascar is also a biodiversity hotspot, with a high percentage of endemic species, including lemurs, but
it is not the most biodiverse region of the globe. 
(3) Himalayas are also known for their biodiversity and are home to many plant and animal species, including the snow leopard, but they are not the most species-rich region on the planet. The Amazon Rainforest has a much greater number of species.