What must an island have to be counted?

Land above water all year and at least one tree

Thousand Islands Quiz: Boldt Castle and St. Lawrence Isles

This Thousand Islands quiz cruises the St. Lawrence River past castles, cottages and tiny islands. Play an interactive set of 10 questions on the official island count, the rule about trees, Boldt Castle on Heart Island, George Boldt's sad story, Singer Castle, Thousand Island dressing, the 1938 bridge opened by Roosevelt and Canada's 1904 park.

Start Thousand Islands Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

River
Which river holds the Thousand Islands?
Border
Which two countries share the islands?
Count
About how many islands are there?
Rule
What must an island have to be counted?
Castle
Which castle stands on Heart Island?
Story
Why did construction of Boldt Castle stop in 1904?
Singer
Which castle on Dark Island was built for a sewing machine company leader?
Food
Which salad dressing is named after the region?
Bridge
Who helped open the Thousand Islands Bridge in 1938?
Park
Which Canadian national park protects some islands?

Explanations: answer key for all 10 questions

Q1: Which river holds the Thousand Islands?
Answer: St. Lawrence River
It flows from Lake Ontario.
Q2: Which two countries share the islands?
Answer: Canada and the United States
The border winds among them.
Q3: About how many islands are there?
Answer: About 1,864
The name undercounts them.
Q4: What must an island have to be counted?
Answer: Land above water all year and at least one tree
Tiny rocks don't count.
Q5: Which castle stands on Heart Island?
Answer: Boldt Castle
It was built for a hotel owner's wife.
Q6: Why did construction of Boldt Castle stop in 1904?
Answer: Boldt's wife Louise died
Workers left it unfinished for decades.
Q7: Which castle on Dark Island was built for a sewing machine company leader?
Answer: Singer Castle
It has hidden passages.
Q8: Which salad dressing is named after the region?
Answer: Thousand Island dressing
Local legends credit a fishing guide's wife.
Q9: Who helped open the Thousand Islands Bridge in 1938?
Answer: Franklin Roosevelt
Canada's prime minister joined him.
Q10: Which Canadian national park protects some islands?
Answer: Thousand Islands National Park
It was created in 1904.

Castles and Cottages on the St. Lawrence

The Thousand Islands are scattered along the St. Lawrence River where it flows out of Lake Ontario, straddling the border between Canada and the United States. There are about 1,864 islands; to count, an island must stay above water all year and support at least one tree.

George Boldt, manager of New York's Waldorf-Astoria hotel, began Boldt Castle on Heart Island as a gift for his wife Louise. When she died in 1904, work stopped and the castle sat empty for decades until restoration began in the 1970s. On Dark Island, Singer Castle, built for a Singer sewing machine leader, has secret passages.

Thousand Island dressing is named after the region. In 1938 Franklin Roosevelt and Canadian Prime Minister Mackenzie King opened the Thousand Islands Bridge. On the Canadian side, Thousand Islands National Park, created in 1904, protects islands and shoreline.

What This Quiz Teaches

Travel fans will enjoy these questions.

Where the islands are
How many there are
Which castles stand there
Which foods share the name
How the area is protected

Did You Know?

Boat tours pass both Canadian and American islands.
Many islands hold just one summer cottage.
Shipwrecks in the river attract divers.
Muskellunge fishing is popular there.
Ships travel the St. Lawrence Seaway past the islands.