Mount Api is a limestone mountain located in Gunung Mulu National Park in Sarawak, Malaysia. It is part of the same formation as Mount Benarat and Mount Buda. Mount Api is notable for its striking limestone karst formations, commonly known as "the pinnacles". The mountain hosts many caves, with passages linking to the massive Clearwater Cave system. It features a great diversity of pitcher plants, with at least eight different species recorded on the mountain. This 2019 photograph shows the karst pinnacles near the peak of Mount Api.Photograph credit: Nur Nafis Naim