Reefwander
Grey-green columns of jointed rock stand in a row along a lake bed, with fallen blocks below and pale blue water above — Lake Shikotsu

Lake Shikotsu · Japan · Freshwater

Poropinai

Clear lake water and shoals under the jetty

Area photo: 663highland · CC BY 2.5

Poropinai is a shore entry on Lake Shikotsu, the caldera lake in Hokkaido, with water of outstanding clarity. The bottom runs from 3 to 20 m, and a jetty on the shore holds large shoals of fish, so the dive suits a range of experience levels from beginner to advanced.

Also known as ポロピナイ.

Where it is and how deep

Depth profile of Poropinai: typical dive 3–20 m (10–66 ft) 18 m · Open Water30 m · Advanced40 m · Recreational limit3 m20 mtypical dive
Depths on a shared scale to 40 m (130 ft); dashed lines mark common certification limits.

No published position for this site — the map shows Lake Shikotsu and its other sites; operators know the mooring.

The dive

The dive starts from the beach and works down a bottom that runs from 3 to 20 m. The water seldom clouds over the year, so the clarity stays high on most days. Under the jetty, shoals of Ezo dace and rainbow trout gather, and at busy times the shoals pass 1000 fish.

Marine life and season

  • Freshwater fish
Month-by-month season rating for Poropinai
JanFebMarAprMayJunJulAugSepOctNovDec
GoodGoodGoodGoodGoodGoodPrimePrimeGoodGoodGoodGood

Season follows Lake Shikotsu: Diving runs all year; late June to August is the top season, and January and February bring dives under the ice.

Sources

  1. 積丹半島・支笏湖・函館臼尻のダイビング見どころ — Diver Online

More dive sites in Lake Shikotsu

A volcanic rock drop-off in a calm lake

to 20 mintermediate

Freshwater

Driftwood from the lake's formation on the bed

to 12 mbeginner

Similar dives elsewhere

Freshwater

Capernwray (Jackdaw Quarry)

Capernwray & the Lake District · United Kingdom

A minesweeper, a yellow Wessex helicopter and garden gnomes in one quarry

2–20 m · max 21 mbeginner

Freshwater

Dixi

Attersee · Austria

A submerged pile-dwelling model that becomes a nativity scene every Advent to Candlemas

to 22 mintermediate

Freshwater

Grönhögen stenbrott

Öland & the Kalmar Strait · Sweden

Limestone quarry full of crayfish, dived in any weather

to 15 mbeginner

Freshwater

Hästholmen

Lake Vättern · Sweden

A loop around a small island straight from a harbour ramp

to 20 mintermediate