The Thousand Islands, Ontario
Islands & Castles on the St. Lawrence
Hundreds of forested isles, grand castles, and boating on the great river.
At a glance · 5 reasons to go
Why The Thousand Islands, Ontario.
Cruise among 1,800+ forested islands.
Tour fairytale Boldt Castle.
Boating, kayaking, and fishing.
Pretty river towns and sunset cruises.
A scenic St. Lawrence playground.
Read the full story
The Thousand Islands sprinkle over 1,800 forested isles across the St. Lawrence River — many crowned with cottages and even castles like fairytale Boldt. Cruise, kayak, and island-hop this dreamy boating paradise on the US–Canada line.
Read this before you go
安全情報
Safety Overview
The Thousand Islands, Ontario
STUB: Add overall safety summary for The Thousand Islands, Ontario.
Emergency Contacts — Save These Now
- Police
- TODO
- Medical
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Reviewed: 2026-06-06
If It’s Safe Travel… Travel Well.
Before You Travel
Five minutes of preparation means your whole group has emergency numbers, hospitals and your GPS location available offline — no WiFi needed when it matters most.
Traveling to The Thousand Islands, Ontario with a pet?
🇨🇦 Canada has specific entry rules — microchip, rabies, permits and more. See exactly what your pet needs before you book.
See the pet travel rules →