Karimunjawa guide: Java's marine park islands, snorkelling and ferries

How Karimunjawa works: islands, town and the national park

Indonesia's Ministry of Tourism describes Karimunjawa as 27 islands with about 1,500 hectares of land and some 110,000 hectares of sea. The archipelago became a strict nature reserve in 1986, and in 1999 the Ministry of Forestry made it Karimunjawa Marine National Park, covering 111,625 hectares. Since 2020 the islands have formed the core of UNESCO's Karimunjawa-Jepara-Muria Biosphere Reserve, which notes nesting sites for hawksbill and green turtles and legal protection for giant clams (kima).

Only five islands are inhabited, according to the ministry: Karimunjawa, the largest and the centre of services, Kemujan, which has the airstrip, and Nyamuk, Parang and Genting. Wikivoyage explains that the main settlement, Karimunjawa town, sits at the southern end of the main island; the ferries dock there and most services are there, while hotels are scattered around the island. Kemujan is separated from the main island only by a narrow channel, and its airstrip lies about 22 kilometres from town, Wikipedia notes.

The islands are Javanese-speaking, and Wikivoyage warns that little English is spoken, so a few words of Indonesian help. It also notes that the main island has had 24-hour electricity in most places since 2016, while some outer islands may have power for only part of the day. Pay the national park ticket when you get off the boat and keep it: when we checked on 2026-10-03, the Ministry of Tourism's Karimunjawa page listed the entrance fee as around IDR 150,000 for international visitors and IDR 5,000 for domestic visitors.

• Karimunjawa town: ferry pier, alun-alun (town square) food stalls, homestays, ATMs and the snorkelling boats.
• Elsewhere on the main island: beach resorts and hill hotels, reached by scooter or car.
• Kemujan: the airstrip, mangroves and a few isolated resorts in the north.

Snorkelling day by boat: Menjangan Kecil and the Cemara islets

The reason to come is the water. The ministry lists Gosong Island, Menjangan Kecil, Tengah, Tanjung Gelam and Cemara Kecil among the favourite snorkelling spots, and counts 176 coral species and 444 fish species in the park. Hawksbill and green turtles occur here, and two protected corals, black coral and organ-pipe coral, grow on the reefs.

Most visitors join a shared day boat from the small tourist pier near the alun-alun. Wikivoyage describes a typical day as one snorkel stop near Menjangan Kecil, lunch and swimming on Cemara Besar, a second snorkel near Cemara Kecil and a final island stop, running roughly from morning to late afternoon in groups of up to about a dozen, with masks and lunch included. Your hotel or homestay can usually book a place for you; ask what is included and whether life jackets are on board. Wikivoyage recommends them for beginners.

On Menjangan Besar, close to town, there is a shark pen (penangkaran hiu) where visitors can get into the water with reef sharks; the ministry describes it as supervised by a guard. It is a captive enclosure, so decide for yourself whether it fits your trip; the open reefs are the alternative. For scuba diving, Wikivoyage mentions sites such as Taka Panyawangan and Gosong Cemara, and the wreck of a coal ship that sank off Kemujan in 1960. Whatever you do in the water, do not stand on or touch coral; the ministry asks visitors to respect the reef and not to litter.

Getting there: Jepara, Semarang and the weather

The main gateway is Kartini harbour in Jepara, on the north coast of Central Java. The ministry lists two services from there: the slow ferry KMP Siginjai and the faster Express Bahari boat. When we checked on 2026-10-03, the ministry's Karimunjawa page listed Siginjai adult fares at IDR 130,000 in economy and IDR 150,000 in VIP. Wikivoyage, updated in April 2024, puts the Siginjai crossing at about five hours and the fast boat at about two, and advises being at the port at least an hour before departure, as the ferry has sometimes left early.

Neither boat runs every day, and the days change, so check the current timetable with the operator or your hotel before you fix your dates; our advice is to plan the whole trip around the boat days. Siginjai tickets can be booked online, though Wikivoyage reports that the booking needs an Indonesian bank account, so many visitors ask their homestay to help. Wikivoyage notes that the fast boat may need booking ahead in high season, and the ministry recommends booking transport and rooms well ahead in holiday periods.

From Semarang, the ministry lists PELNI ships from Tanjung Emas port, which, Wikivoyage notes, use the pier in the north of the island rather than the town pier. Wikivoyage also lists a fast boat from Kendal, just west of Semarang. To reach Jepara by road, it estimates about two hours from Semarang by shuttle van (travel), and the Daytrans shuttle stops at Jepara's Kartini ferry terminal. If your boat leaves early in the morning, sleep in Jepara the night before.

All boats sail only when the waves are low to moderate. Wikivoyage records that at the end of 2014 about 500 visitors were stranded by 3.5-metre waves and the island's ATMs ran dry, and it advises carrying cash for at least five days. Pack seasickness tablets if you need them, as the ministry suggests, and do not book a non-refundable flight home for the day you return from the island.

A scooter day: beaches, mangroves and the viewpoints

Rent a scooter or a car with a driver for a day on land; Wikivoyage notes that there are few cars on the islands, so book one in advance if you need it. The ministry singles out the beach at Tanjung Gelam (also called Ujung Gelam) for its sunset, so time your ride to end there. Wikivoyage maps other beaches such as Batu Topeng, Bobby Beach and Batu Putih near the airstrip.

The ministry describes a mangrove trail, a winding raised boardwalk through some of the 45 mangrove species found here, with a watchtower midway. The ministry mentions monkeys and a variety of birds along the way, and advises bringing water, as the sun is fierce. Inland forest outside such trails is protected: Wikivoyage notes that entry to the natural forest requires a national park guide.

For views, the ministry points to Bukit Love (Love Hill) above town, though Wikivoyage reports that access may have changed, so ask locally, and to Bukit Joko Tuo, where a whale skeleton is displayed as a monument. Wikipedia notes that the tomb of Sunan Nyamplungan, a son of one of the nine Islamic saints of Java who is said to have settled the island, is an important pilgrimage site; dress modestly if you visit.

When to go and practical tips

The Ministry of Tourism recommends April to October, when the sea is calmer. Wikivoyage describes this dry season as very hot and the rainy months, around December to March, as wet and humid, with high waves that can stop boats for a day or two between December and February. Wikipedia also notes that crossings are sometimes limited from January to March. Book boats and rooms early for Indonesian holiday periods, as the ministry advises.

Bring enough cash for the whole stay and a few extra days, since the ATMs have run out when boats were cancelled. Alcohol is hard to find, Wikivoyage reports, and is served at only a few tourist restaurants and resorts. Take sun protection for long days on open boats, and pack out your rubbish from the uninhabited islands.