Harlequin Slope

A black sand muck slope located approximately 200 meters southeast of the famous USAT Liberty wreck in Tulamben, named for the harlequin shrimps that hide beneath rocks at depth.

Overview

Harlequin Slope is a black sand muck diving site on the Tulamben coast of northeast Bali. The site sits roughly 200 meters southeast of the USAT Liberty wreck, offering a completely different diving experience from the wreck itself. The bottom is composed of volcanic black sand formed into ridges, with small coral outcrops scattered across the slope. The site descends to approximately 29 meters and is best known for its resident harlequin shrimps, which can be found sheltering under rocks at depth — the feature that gives the site its name.

Site Information

• Location: Tulamben, East Bali, Indonesia
• Entry Type: Shore entry
• Site Type: Muck dive
• Difficulty Level: Intermediate
• Maximum Depth: 29 meters
• Typical Visibility: 15-25 meters
• Water Temperature: 27-29°C
• Current: Generally mild
• Best Time: April to November (dry season)

Marine Life

The black sand environment at Harlequin Slope supports a rich variety of critter life. The site’s namesake harlequin shrimps are found under rocks at depth and are a prized sighting for macro photographers. The sand ridges and coral outcrops harbour diverse nudibranchs, cuttlefish, mantis shrimp, and various crab species. The dark volcanic sand provides excellent contrast for spotting small, well-camouflaged creatures that would be difficult to find on a traditional reef.

Dive Profile

Enter from the rocky beach and descend onto the black sand slope. The bottom is composed of sand ridges running perpendicular to the shore with small coral outcrops between them. Work along the ridges at depth, checking under rocks and around coral heads for harlequin shrimps and other critters. The most productive hunting grounds for small invertebrates are in the 15-29 meter range. Allow adequate air for a gradual ascent and safety stop.

Entry and Exit

Shore entry from the rocky beach near Tulamben. The entry is over rocks and can be slippery, so take care with footing. Walk in with fins in hand and put them on once waist-deep. Exit at the same point.

Tips and Recommendations

• Bring a dedicated macro lens setup — this is primarily a critter-hunting dive
• A good dive guide is essential for locating harlequin shrimps and other well-hidden subjects
• Dive slowly and stay close to the bottom for the best chance of spotting camouflaged animals
• Morning dives tend to offer calmer surface conditions at the entry point

Safety Considerations

The rocky beach entry requires care, particularly when carrying camera equipment. The sand slope has no strong currents under normal conditions, but maintain good buoyancy control to avoid silting out the black sand and reducing visibility for yourself and other divers. The maximum depth of 29 meters limits bottom time on air — plan your gas management accordingly.

Photography

Harlequin Slope is a dedicated macro photography site. The black sand provides clean, dark backgrounds that make critter subjects stand out beautifully. A 60mm or 100mm macro lens is ideal. Harlequin shrimps, nudibranchs, and cuttlefish are the primary targets. Bring a focus light to assist with finding and illuminating small subjects on the dark substrate.

Sources: Michael McFadyen’s Scuba Diving Web Site. Note: no second independent source found for this site — validation_source remains single-source until confirmed. Last updated 2026-07-17.