One example sentence could be: "The Amazon jungle is the world's largest tropical rainforest." A tropical rainforest is a type of ecosystem that is hot, wet and contains a wide variety of plant and animal life.
Rainforests are usually called tropical because they tend to grow near the equator, between the Tropic of Cancer and the Tropic of Capricorn. They are characterized by year-round temperatures above 68 degrees Fahrenheit and consistently high annual rainfall of no less than 66 inches a year. Major tropical rainforests include the Amazon Rainforest in South America, the Ituri Rainforest in Africa and the Harapan Rainforest in southeast Asia.