Kalimantan

Balikpapan is an oil and gas industry city on Kalimantan's east coast, historically built around petroleum extraction and refining, and functions today mainly as a business hub and transport gateway rather than a tourist destination in its own right. Most travelers pass through en route to Berau and the Derawan Islands, the Mahakam River's Dayak villages and orangutan areas further inland, or increasingly to see the early stages of Nusantara, Indonesia's new purpose-built capital city under construction nearby in East Kalimantan, a major national infrastructure project that's drawn curiosity visits. The city itself has a modern, orderly feel by Kalimantan standards, with decent hotels and restaurants catering to the oil industry's expatriate and business community, plus a conservation area at Kilometer 4 where wild proboscis monkeys — a species endemic to Borneo, known for the males' large pendulous noses — can be seen from a boardwalk through mangrove forest, a rare easy urban wildlife encounter.

Banjarmasin is South Kalimantan's main city, built along and defined by its rivers, earning it the nickname "City of a Thousand Rivers." Its best-known attraction, the floating markets at Lok Baintan and Muara Kuin, are genuine working markets where Banjarese traders, mostly women in wide-brimmed hats, sell produce and goods from small wooden boats clustered together on the water at dawn — one of Indonesia's most distinctive and least staged traditional market experiences, though it requires committing to a very early start to see it functioning rather than winding down. Beyond the markets, Banjarmasin has a network of river life worth exploring by klotok boat, including stilt houses along the waterways and access to Kalimantan's interior. Nearby Martapura is known for its diamond and gemstone trade and traditional markets, and the region carries Banjar sultanate history reflected in local architecture and museums. The city itself is humid, low-lying, and unglamorous, but its river-centric way of life is distinctive enough to reward a couple of days.

Berau is the regional gateway to the Derawan Islands, an archipelago off East Kalimantan's coast known for exceptional diving and snorkeling — manta rays at Sangalaki, sea turtles that nest directly on Derawan's beaches in large numbers, and, most famously, Kakaban Island's stingless jellyfish lake, an isolated saltwater lake where millions of jellyfish evolved without natural predators and lost the ability to sting, letting swimmers float among them. The town of Berau itself is a modest transit point with little to hold visitors' attention; almost everyone heading here is en route to the islands via Tanjung Batu port, from where boats fan out to Derawan (the main inhabited island, with basic resorts and dive shops), Maratua (increasingly developed with higher-end resorts and its own airstrip), and the various day-trip islands nearby. It's a less crowded, less developed alternative to Indonesia's better-known dive destinations, which is a real part of the appeal but also means more limited infrastructure, patchier electricity, and higher costs given the remoteness and logistics of supplying the islands.

Ketapang is a modest port town in West Kalimantan, notable mainly as an access point for Gunung Palung National Park, one of Borneo's significant remaining rainforest reserves and home to wild orangutans, though far less set up for tourism than the more established Tanjung Puting park near Pangkalan Bun. Visiting requires more advance planning, a guide, and comfort with basic facilities, since infrastructure here caters to research and conservation work more than tourist traffic. The town itself is unremarkable and functions as a supply and transit point rather than a destination; most travelers who make the effort to come are specifically interested in Gunung Palung's biodiversity and are prepared for a rougher, less commercialized version of an orangutan-viewing trip than Tanjung Puting offers.

Palangkaraya is the capital of Central Kalimantan, a planned city built in the 1950s with wide boulevards and was, notably, once floated as a potential alternative national capital decades before the current Nusantara project took shape in East Kalimantan instead. For travelers, it's primarily useful as a base for visiting Central Kalimantan's peatland forest and orangutan conservation efforts, including the well-regarded Nyaru Menteng rehabilitation and release center run by the Borneo Orangutan Survival Foundation. The city itself is quiet and modest by Indonesian capital-city standards, without major standalone tourist attractions, but its river, the Kahayan, offers boat access into surrounding forest and swamp areas, and it serves as a reasonable, less-touristed alternative base to Pangkalan Bun for those interested in Kalimantan's orangutan conservation work specifically.

Pangkalan Bun is the gateway to Tanjung Puting National Park, one of the best and most accessible places in the world to see wild and semi-wild orangutans, and the primary reason most visitors come to this part of Kalimantan at all. The standard way to experience the park is a multi-day trip aboard a klotok, a traditional wooden houseboat that serves as transport, dining room, and sleeping quarters (usually on a mattress laid out on deck under mosquito netting) while drifting slowly up the Sekonyer River, stopping at feeding platforms where researchers have habituated formerly captive or rescued orangutans. Camp Leakey, the park's most famous station, was founded by primatologist Biruté Galdikas in the 1970s and remains an active research site as well as a viewing point; visitors typically also stop at Pondok Tanggui and Tanjung Harapan, seeing not just orangutans but also proboscis monkeys, macaques, and abundant birdlife along the river. The slow, immersive pace of a klotok trip — typically two to four days — is much of the appeal, offering a genuinely different rhythm from Indonesia's more conventional tourist circuits. The town of Pangkalan Bun itself and the port of Kumai are unremarkable and purely functional, existing to service the park trade; almost nobody visits this part of Kalimantan for the towns themselves.

Pontianak is West Kalimantan's capital and one of the few sizeable cities in the world built essentially on the equator, marked by a modest monument just outside the city that draws visitors curious to stand on the line itself, particularly around the equinoxes when the sun passes directly overhead. Beyond the equator novelty, the city has a notable Chinese-Indonesian heritage reflected in its temples and Chinatown-adjacent areas, and sits on the Kapuas River, Indonesia's longest river, which remains central to trade and transport in the region. The city itself functions mainly as a gateway to West Kalimantan's interior — Dayak longhouse communities, national parks, and river journeys further upstream — rather than holding major standalone attractions, though its riverside life, markets, and equatorial monument make for a worthwhile day or two before heading further into the province.

Tanjung Puting National Park: Tanjung Puting is Borneo's best-known place to see wild and semi-wild orangutans, via multi-day river cruises on a klotok houseboat that stops at feeding platforms like Camp Leakey along the way. Unlike a zoo encounter, this involves slow travel up jungle rivers, sleeping on the boat deck, and watching rehabilitated and wild orangutans (plus proboscis monkeys, common along the riverbanks at dusk) in a setting that feels remote. Most trips run 2-4 days, since the park's size and the boat-based access make it inefficient to rush. The pace is part of the appeal — days built around river travel, jungle walks at ranger stations, and evenings watching wildlife from the boat.

Tarakan is a small island city off North Kalimantan's coast, historically significant as a WWII battle site (fought over for its oil resources) with several war-era relics and cemeteries still found around the island, and today functions mainly as a transit hub for the wider North Kalimantan region, including routes toward the Malaysian border and Kayan Mentarang National Park's interior Dayak communities. The city itself has a mangrove conservation area within its limits where wild proboscis monkeys can be seen relatively easily, along with some low-key beaches and a workaday harbor feel. Most travelers use Tarakan briefly before continuing further into North Kalimantan's less-visited interior or across the border, rather than treating it as a destination in itself.