Ishigaki tide times

Kabira Bay is designated a prohibited swimming area because of the active black pearl oyster aquaculture operating in the bay. The submerged pearl oyster culture systems — lines, nets, and raft infrastructure below the surface — create entanglement risk for swimmers and potential damage to the farming operations. Glass-bottom boat tours from the bay's small pier give clear views of the underwater scene without the risks. Kabira's water is safe to enter by kayak or glass-bottom boat; the prohibition is specifically against free swimming and diving within the bay boundaries. The pearl farming here produces some of Japan's highest-grade Akoya and South Sea black pearls.

Mean tidal range at Ishigaki is approximately 1.7 metres above MLLW — larger than at Naha (1.5 m) and Miyakojima (1.2 m). Spring tide range can reach around 2.0 metres above MLLW. The wider range reflects Ishigaki's position at the outer, more directly exposed margin of the Ryukyu chain. For reef access, this range means the difference between high and low water over the fringing reef systems is significant — at lower spring tides, reef platforms that are 1.5 to 2.0 metres underwater at high tide emerge to near the surface or above it. Kondoi Beach on Taketomi and the Ishigaki fringing reef systems change character substantially through a tidal cycle. Snorkelling and walking reef access windows are best planned against current tide tables.

Manta rays are reliably sighted at the cleaning stations near Kabira Bay and at 'Manta Scramble' — a dive site north of Ishigaki in the channel toward Iriomote. The best season is June through October when water temperatures are warmest (28 to 30°C). Manta Scramble in particular produces encounters in most conditions through that period; the site sits in 10 to 20 metres of water at a cleaning station where mantas return regularly. Dive operators in Ishigaki run dedicated manta boat trips year-round, with highest frequency and reliability from late June through September. Whale shark sightings in the Ishigaki area are documented most often in June in the channel between Ishigaki and Iriomote.

Taketomi is a flat coral island 6 km from Ishigaki port (10-minute ferry). The village of around 350 residents has maintained a traditional Ryukyuan streetscape — whitewashed coralstone walls, red tile roofs, shisa guardian lion figurines on every roofline — largely intact. The island's flat topography, narrow lanes, and village-scale make it navigable on foot or by bicycle. Water buffalo cart rides through the village lanes are the signature visitor experience. Kondoi Beach on the west coast has a long reef flat that exposes at lower tidal states. The ferry from Ishigaki runs frequently; a day trip is straightforward, though staying overnight (in a traditional guesthouse) gives a quieter evening experience after day visitors leave.

No. Predictions here come from Open-Meteo Marine, a gridded global ocean model that estimates tidal heights and timing from astronomical inputs. Accuracy is typically within plus or minus 45 minutes on timing and 0.2 to 0.3 metres on height relative to observed levels. For navigation in the Yaeyama islands' channels — between Ishigaki, Iriomote, Kohama, and Taketomi — use the Japan Meteorological Agency's official tide tables at jma.go.jp. JMA publishes authoritative predictions for Ishigaki and is the reference source for inter-island ferry and boat operators. This page is a planning and reference tool, not a substitute for official data.