Krakatoa was a volcanic island between Java and Sumatra. Krakatoa is part of Province of Lampung in Sumatera. The eruption of mount Krakatoa in 1883 was one of the most violent volcanic events on record. A huge explosion (150 megatons of TNT) occurred as seawater hit hot magma and turned instantly to steam. The blast was heard over 4000 km (2500 miles) away in Australia and India. The Volcano Explosivity Index (VEI) of the eruption is 6 (colossal).
The whole volcano was destroyed because of the massive explosion. Parts of the volcano fell into the sea and caused giant tsunami (40 meters). The dust from the eruption reached the stratosphere and affected weather worldwide for several years. More than 35,000 people are killed by tsunami and eruption.
Only about a third of the pre-1883 island survived the blast.
From 1927 to 1930, there were several underwater eruptions on the site of the old Krakatoa volcano. On August 11, 1930, a new volcano and island appeared. This new volcano and island are called "Anak Krakatau" (Child of Krakatoa).
The island of Anak Krakatoa is a national park. To land on the island, tourist must obtain a permit from Balai Konservasi Sumber Daya Alam (BKSDA).
You can reach Anak Krakatoa Island using boats from Anyer beach or Carita beach (Banten), or Lampung.
You can stay in Labuan in Rawayan Hotel for 100.000 RP a Room (Fan, Toilet inside, clean, quiet). Good and cheap Restaurants nearby. Udin Supendi from there offers a reasonable cheap an good Package for visiting the Vulcano. Tel. 081317501278. The Package includes Boat, Food, Drinks and costs 80 US$ per person, minimum 2 persons. The trip is 3 1/2 hours depending on the weather. The boat can carry 6 people. Udin has 18 years experience in guiding an can show many recommendations. When arriving in Jakarta you should call Udin to arrange your tour. He also offers Private Car Charter from Jakarta.
The cheaper option is to get boat at Canti Port. You can reach Canti Port from Kalianda with motorcycle taxi (Ojeg) for Rp 10,000 or minibus for Rp 5,000. If you want to hire a boat traditional fishing boat) to take you to Krakatoa, you can make a deal with the boat owner there. One day boat rental will cost you around Rp 1,500,000 (day time only). In this case, you have to bring your own live vest because this traditional fishing boat will not provide it. If you still the price a little bit too higher, you can continue your journey to Sabesi Island to get a cheaper option. Regular boat from Canti Port only operate from 11:00 AM to 2:00 PM. Regular boat only cost for Rp 15,000. If you are in the rush to Sabesi, you can hire a boat for only Rp 400,000 one way. In Sabesi Island, you can contact some fishermen there who will welcome you to hire their boat. The price for the boat will be around Rp 300,000 for day time and Rp 600,000 for night time. You have to bring your own food and live vest. One of the rangers on this island can arrange a convenient trip to Krakatau. The price will include boat, food, tend and a tour guide. He also provides the live vest. You can negotiate the price with him directly.
Beware of strong current and large waves during August, September, October, and November. Anak Krakatao is an active volcano.