Ago Bay
A ria coast of sixty islands and pearl rafts, where the world's first cultured pearl was produced in 1893.
Updated 19 October 2026
Ago is a drowned river valley - a ria coast, where rising sea filled the branching valleys and left a bay of about sixty islands, narrow inlets and calm sheltered water. That calm is why the pearl industry took hold: Mikimoto Kokichi produced the first cultured pearl in these waters in 1893 and perfected the round pearl by 1905, and the wooden rafts anchored across the bay, from which oyster baskets hang, are still a working industry and the visual signature of the place. Sightseeing boats, some rigged as Spanish galleons, cross between the inlets, and the Yokoyama viewpoint above Kashikojima gives the whole bay at once, which is the best way to understand the shape of it. The Shima peninsula is inside Ise-Shima National Park, and the bay's other tradition is the ama - women who free-dive for shellfish, some of whom host lunches in seaside huts.
History
The area was first known as Miketsu-kuni, a name that marked it as a source of food. Kōkichi Mikimoto first cultivated pearls in the bay in 1893, and the cultured pearl industry soon took root here (Wikipedia, Ago Bay).
What you'll find
- A ria coast - drowned valleys making a bay of about sixty islands.
- Pearl rafts - working oyster culture anchored across the sheltered water.
- The Yokoyama viewpoint - the whole bay shape from above Kashikojima.
- Ama divers - free-diving shellfish gatherers, some hosting hut lunches.
When to go
March to November. Two days. Clear mornings for the viewpoint.
Practical notes
The bay is dispersed and getting between points takes time. Cruise boats are dressed up in ways that some find tacky. Ama hut lunches must be booked in advance. Typhoon season disrupts boats in late summer.
Nearby
Ise Jingu is north; Toba and Mikimoto Pearl Island are north-east.
Key facts
Source: Wikidata, item Q2879577, read on 18 October 2026.
What to pack for Ago Bay
Chosen from what this place is for. Tap a kit for the full checklist.
- Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
- Your own mask + snorkel - A well-fitting mask is the single biggest comfort upgrade underwater. Find on Amazon
- Shelter suited to the place - Tent, tarp or hut booking - match it to the terrain and rules. Find on Amazon
- Layers + a waterproof shell - Mountain weather turns fast; a packable rain jacket saves the day. Find on Amazon
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