Dive Site: The Arch

About The Arch

The Arch is a captivating intermediate dive site located off Ternate Island in the Alor Archipelago, Indonesia. It gets its name from a spectacular natural underwater rock arch that forms the centerpiece of the site, making it a unique topographical feature. The site is a wall dive characterized by numerous small caves and overhangs, all richly decorated with a profusion of colorful soft corals and delicate sea fans. It offers divers an immersive experience within a vibrant reef ecosystem. While not known for large pelagic species, The Arch is a favorite among divers for its stunning coral formations and the abundant reef life it harbors. You can expect to encounter a thriving community of reef fish, including a notable resident school of sweetlips that often congregates around the arch. The lack of strong currents at this particular site makes it an accessible and enjoyable dive for those with some experience, focusing on exploration of its unique structure and resident marine biodiversity. The Alor region itself is renowned for its diverse underwater habitats, from volcanic sand slopes to pristine coral gardens, all nourished by nutrient-rich currents. The Arch exemplifies the healthy reef ecosystems found here, showcasing the archipelago's commitment to marine conservation. Its accessibility and picturesque qualities make it a popular spot for underwater photography, particularly for wide-angle shots capturing the arch's grandeur and its colorful inhabitants.

Dive site facts: The Arch

Depth

12–30 m

Current

Mild to moderate

Visibility

15–30 m

Water temperature

25–28°C

Entry

Boat

Level

Intermediate

Dive type

Wall, coral reef, architectural

Region / port

Alor Archipelago, East Nusa Tenggara

Coordinates

-8.137, 124.562

Conditions & Currents

The Arch is generally considered an intermediate dive site with manageable currents, making it enjoyable for divers who have some experience but are not seeking extreme drift dives. While the Alor region is known for its strong and unpredictable currents, this specific site tends to be less affected, allowing for more relaxed exploration of its unique topography. Visibility at The Arch is consistently good, often ranging from 15 to 30 meters, contributing to clear views of the arch and its coral inhabitants. Water temperatures are typically comfortable, ranging from 25 to 28°C, though occasional thermoclines can bring cooler water to deeper sections. Divers should still be prepared for potential shifts in current intensity characteristic of the Alor Sea and ensure they are appropriately certified and equipped.

Marine life & sighting chances

Sweetlips

common

Eagle rays

occasional

Soft corals

common

Sea fans

common

Reef fish

common

Nudibranchs

occasional

Pygmy seahorses

occasional

Dive profile & how the dive runs

Your dive at The Arch typically begins with a boat entry, dropping directly onto the wall near the arch structure. You will descend along the vibrant coral wall, exploring the numerous small caves and overhangs adorned with soft corals and sea fans. The route usually involves circumnavigating the impressive natural arch, allowing for multiple perspectives of this unique formation and the resident school of sweetlips. You can explore depths between 12 to 30 meters, with the most colorful reef life concentrated in the shallower sections. The turn point is determined by air consumption and bottom time, typically after thoroughly exploring the arch and surrounding wall. The safety stop is conducted in the shallower, well-lit areas of the reef before a boat ascent.

Underwater photography

The Arch is an excellent site for wide-angle photography, with the natural rock arch providing a stunning architectural backdrop for your shots. A wide-angle lens is essential to capture the scale of the arch and the extensive coral formations. For details within the caves and overhangs, consider bringing a good external strobe or video light to illuminate the vibrant soft corals and sea fans. When photographing the resident sweetlips school, approach slowly to avoid disturbing them. Given the generally mild currents, you'll have ample opportunity for steady shots, but maintaining good buoyancy is always key to avoiding contact with the delicate reef structures.

Combine with nearby dive sites

• Clown Valley

  Famous black sand muck dive teeming with macro life, including blue-ringed octopus and frogfish.

• Kal's Dream

  A pristine coral wall known for fusiliers, barracuda, and potential hammerhead shark sightings.

• Mahi Point

  Shallow reef paradise ideal for macro photography, featuring pygmy seahorses and ghost pipefish.

• Beang Abang

  A black sand night dive heaven for spotting mimic octopus and flamboyant cuttlefish.

• The Cathedral

  Vibrantly colored soft and hard corals with a small swim-through, featuring blue-ring octopuses and potential mola mola.

Getting there & logistics

Access to Alor, including The Arch, typically involves flying into Kalabahi (ARD) airport. International travelers usually connect through larger Indonesian hubs like Jakarta (CGK) or Bali (DPS) to Kupang (Timor), and then take a domestic flight to Alor. Liveaboards often depart from Kalabahi harbor, offering itineraries ranging from 7 to 13 days that explore various dive sites across the Alor Archipelago. Some trips might combine Alor with other regions like Komodo or Flores. While resort-based diving is available, liveaboards are popular for maximizing dive opportunities and reaching remote sites. Dive permits and national park fees are generally included in liveaboard packages.

Safety & environment

Diving in Alor, including The Arch, requires careful attention to safety protocols due to the region's remote nature. The nearest recompression chamber is located in Bali, necessitating a lengthy evacuation process in case of a serious dive emergency. Comprehensive dive insurance, including coverage for medical evacuation, is highly recommended. While The Arch typically has milder currents, divers should still be proficient in current diving techniques as conditions can change. Always dive with an experienced local guide who is familiar with the site's specifics. Maintain excellent buoyancy to protect the delicate corals and avoid contact with any marine life.

Who it suits — and who it doesn't

FAQ

The Arch FAQ

Liveaboards diving The Arch

These liveaboards may visit The Arch on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Naga Biru

Indonesia

12 guests40 m

$273/day

Jaya

Indonesia

14 guests23 m

$280/day

Komodo Aggressor

Komodo, Indonesia

16 guests29 m

$312/day

Blue Manta

Indonesia

20 guests45 m

$488/day

Gaia Love

Alor

20 guests

$554/day

Emperor Raja Laut

Raja Ampat, Indonesia

12 guests31 m

$413/day

Coralia

Indonesia

16 guests48 m

$577/day

Ilike

Indonesia

16 guests40 m

$298/day

Mermaid I

Alor

15 guests28 m

$371/day

Mutiara Laut

Indonesia

14 guests46 m

$741/day

Neptune One

Indonesia

16 guests38 m

$284/day

Dewi Nusantara

Indonesia

18 guests57 m

$493/day