Introduction

Okishima sits in Lake Biwa, Japan's largest lake, and holds a genuinely unusual distinction: it's the only inhabited island in Japan located on a freshwater lake rather than the ocean. We reviewed a recent travel vlog covering a cherry-blossom-season visit and checked the facts behind what makes this island so unusual.

A Genuinely Rare Kind of Place

Communities living on freshwater lake islands are rare worldwide, which is part of why Okishima has drawn real academic attention, not just tourist interest. It's the largest island in Lake Biwa, sitting roughly 1.5–2 kilometers off the eastern shore near the city of Ōmihachiman in Shiga Prefecture. Most residents historically made their living fishing the lake — a genuinely rare freshwater fishing economy within Japan, where coastal ocean fishing is far more typical.

Population — A Real, Ongoing Decline

Current population figures vary somewhat across sources (commonly cited in the roughly 200–350 range depending on when and how the count was taken), reflecting the same rural depopulation and aging pattern affecting many small Japanese communities, especially island ones where younger residents have far fewer reasons to stay. The demographic shift is real and significant, consistent with the sharp decline described in the source vlog.

Life Without Cars

The island has no cars and no stoplights — residents get around entirely on foot or by bicycle, which functions as genuinely essential daily transport rather than a novelty or tourist gimmick. The village still supports an elementary school, a daycare center, and a post office, meaning it functions as a real, complete (if very small) community, not merely a historic site people happen to still live in.

The Cats of Okishima

Okishima is genuinely nicknamed "Cat Island" and sometimes "Town of Cats" — the island's fishing families have long kept cats around the harbor, historically useful for controlling rodents near stored catch, and today the cats are simply part of daily life on the docks, often seen lounging near the boats or picking at scraps of fish. It's a real, independently documented nickname, not a marketing invention, and puts Okishima in the same loose category as Japan's better-known cat islands like Tashirojima and Aoshima — though Okishima gets far less attention for it, since most round-ups of Japan's cat islands focus on those two.

Practical Tips

• The island rewards slow wandering more than a checklist itinerary — narrow alleys, small shrines, and unplanned corners are a core part of the experience, based on the source vlog's account.

• Cherry blossom season draws real crowds to what is otherwise a quiet island — expect a busier ferry and more foot traffic than the island's usual daily rhythm if visiting in spring.

• If seeing the cats is a priority, the harbor area near the port is the most reliable spot — that's where fishing activity (and food) draws them.

• Respect residents' privacy and daily life; this is a lived-in village, not a preserved museum town, and signage around the island (including near the school) specifically asks visitors not to photograph children.

Sources and Verification Notes

Okishima's status as Japan's only inhabited freshwater lake island, its size and distance from shore, and its current population range were checked against Shiga Prefecture tourism references and academic-adjacent reporting, since population figures in particular vary meaningfully by source and year — we're presenting a range rather than a single precise figure for that reason. The "Cat Island" nickname was independently corroborated across multiple travel publications rather than a single source.