Peleliu, Palau tide times

Peleliu is a flat, heavily forested island 45 kilometres south of Koror by boat — a 13-square-kilometre limestone and coral platform with no permanent road connection to the rest of Palau. Its identity is split between the ecological richness of its surrounding reef system and the historical weight of the Battle of Peleliu, fought between US Marines and Japanese forces from September to November 1944. The battle lasted 74 days at a cost of more than 1,700 American and 10,000 Japanese lives — disproportionately costly by the strategic calculus of the Pacific campaign. War memorials, preserved bunkers, rusting landing craft, and the hulks of Japanese tanks remain on the island and in the surrounding reef, making Peleliu the most significant WWII battlefield in Micronesia.

The tidal regime at Peleliu mirrors the Palau archipelago: mixed semidiurnal, spring range 1.5 to 2.0 metres, two unequal highs and two unequal lows per day. Peleliu's position at the southern edge of the Palau lagoon — exposed more directly to the Philippine Sea swell on its western and southwestern faces — means the open-ocean reef here handles more surge energy than the sheltered Rock Islands sites. Tidal data for Peleliu comes from Open-Meteo Marine, a global gridded ocean model. Accuracy is typically ±45 minutes on timing and ±0.2 to 0.3 metres on height. For diving Peleliu's exposed reef walls, local operator timing is essential: the combination of tidal current and residual swell surge makes entry and exit from exposed sites dangerous if conditions are misjudged.

Peleliu Wall on the island's southwest tip is one of the premier wall dives in Palau — a near-vertical drop from the reef crest at 3 to 5 metres down to 300 metres. The wall is draped with gorgonian sea fans up to 2 metres across, fields of black coral at depth, and large schools of barracuda, jack, and fusilier in the water column off the wall face. The dive runs best on a slack-to-early-ebb window: the current at the wall can build to 2 knots at peak, pulling divers off the wall face and into blue water. Local Peleliu dive operators — several small live-aboard operations berth in Peleliu Harbour — time entry for 30 minutes before predicted slack. Bottom time at 25 to 35 metres is limited by no-decompression limits and by current speed; 40 to 50 minutes is typical before surfacing early on the current.

The WWII wreck sites adjacent to Peleliu add a second diving context. Landing craft hulks lie on the northern reef flat at 5 to 12 metres, within easy reach on a flood tide when visibility through the passage is clearest. The Zero aircraft wreck — a Japanese Mitsubishi A6M fighter — sits upright on the reef at 10 metres near the northern beach. Both sites are accessible to open-water divers and give photographers strong foreground subjects with hard coral growth framing the wreckage. At low water, the reef flat north of Peleliu village becomes too shallow for boat access to the wreck sites; approach from the west channel at 2 metres or above.

For families and non-divers, the WWII land sites are the primary draw. The Peleliu battlefield is accessible on foot or by rented bicycle from the small village at the island's north. Orange Beach — the Marines' landing site — shows the concrete anti-tank obstacles still embedded in the sand. The Peleliu Peace Memorial stands at the northern tip. Bloody Nose Ridge, where Japanese defenders held fortified caves against Marine assault for weeks, runs along the island's spine; the hiking trail is rough limestone and requires sturdy footwear. None of this is tide-dependent, but the boat transfer from Koror is: the boat passage south through the Rock Islands lagoon crosses open water near the lagoon's southern edge, where swell is higher at low water when the reef provides less attenuation.

Kayakers on Peleliu work the eastern and northern lagoon edges, where the reef flats are sheltered from the prevailing southwest swell and the water is calm above half tide. The eastern coast has a series of small coves with sandy floors at 0.5 to 2.0 metres — snorkellable from a kayak seat at high water. Low water on springs dries the inner cove floors to a few centimetres; time the return paddle to avoid being stranded inside a cove on a falling tide in the dark. Sunset from the island's western reef edge is unobstructed Pacific horizon — photographers should plan for low-to-mid tide to access the reef-edge viewpoints before the flat is submerged at high water.