The phrase "highest volcano" refers to the tallest or highest volcanic mountain in the world. It means the volcano that reaches the greatest height above the ground or sea level compared to other volcanoes. Full definition
Located on Lombok, the neighbouring island to Bali, Rinjani is the second highest volcano in Indonesia, rising to a height (balitoursandmore.com)
Trekking is a popular activity on Lombok — whether it is climbing Mt Rinjani, the second highest volcano in Indonesia or trekking through jungles to find hidden waterfalls, or just taking peaceful strolls through traditional villages and along the edges of rice paddies. (twofishdivers.com)
Bali is an island of high volcanoes, rice fields, temples and beautiful beaches. (micksplacebali.com)