Tangkuban Perahu is a stratovolcano 30 km north of the city of Bandung, the provincial capital of West Java, Indonesia. It erupted in 1826, 1829, 1842, 1846, 1896, 1910, 1926, 1929, 1952, 1957, 1961, 1965, 1967, 1969, 1983, 2013 and 2019. It is a popular tourist attraction where tourists hike or ride to the edge of the crater to view the hot water springs and boiling mud up close, and buy eggs cooked on the hot surface.

Tapanuli is a region that covers the west coast of North Sumatra to the shores of Lake Toba. Tapanuli comes from the phrase "tapian nauli" which means "beautiful bathing waters". Tapanuli is bordered by the plains of Southeast Aceh and the Bukit Barisan Mountains, separating it from the eastern coast of North Sumatra, commonly referred to as East Sumatra.

Tumpeng is an Indonesian cone-shaped rice dish with side dishes of vegetables and meat originating from Javanese cuisine of Indonesia. Traditionally featured in the slamatan ceremony, the rice is made by using a cone-shaped woven bamboo container. The rice itself may be plain steamed rice, uduk rice (cooked with coconut milk), or yellow rice (uduk rice colored with kunyit (turmeric)).

Tarakan is an island and the largest city of the Indonesian province of North Kalimantan. The island city is located in northern Borneo, midway along the coast of the province. The city boundaries are co-extensive with the island (including a couple of small islands off the coast of the Tarakan Barat District)

The Trisakti shootings, also known as the Trisakti tragedy (Indonesian: Tragedi Trisakti), took place at Trisakti University, Jakarta, Indonesia on 12 May 1998. At a demonstration demanding President Suharto's resignation, TNI-AD soldiers opened fire on unarmed protestors.

Tarumanagara or Taruma Kingdom or just Taruma is an early Sundanese Indianised kingdom, located in western Java, whose 5th-century ruler, Purnawarman, produced the earliest known inscriptions in Java, which are estimated to date from around 450 CE.

Lake Toba (Indonesian: Danau Toba) is a large natural lake in North Sumatra, Indonesia, occupying the caldera of a super volcano. The lake is located in the middle of the northern part of the island of Sumatra.

Tidore (Indonesian: Kota Tidore Kepulauan, lit. "City of Tidore Islands") is a city, island, and archipelago in the Maluku Islands of eastern Indonesia, west of the larger island of Halmahera. Part of North Maluku Province, the city includes the island of Tidore (and smaller outlying islands) together with a large part of Halmahera Island to its east.

Mount Tambora, or Tomboro, is an active stratovolcano in West Nusa Tenggara, Indonesia. Located on Sumbawa in the Lesser Sunda Islands, it was formed by the active subduction zones beneath it. Before 1815, its elevation reached more than 4,300 meters (14,100 feet) high, making it one of the tallest peaks in the Indonesian archipelago.