Canadian tourists have visited the customs without indicating the time of stay.

What you want to ask is why Canadian tourists didn't mark their stay time at the customs? Policy reasons. According to the data in the query, official website shows that Canadian tourists don't clearly indicate the time on their documents when they visit their friends at the customs. It is a policy stipulated by the Canadian government. Citizens need to calculate their own time and stay for six months. Ottawa, the capital of Canada, is located in the north of North America, bordering the Atlantic Ocean in the east, the Pacific Ocean in the west, Alaska in the northwest, the United States in the south and the Arctic Ocean in the north. Most of the climate is sub-cold zone coniferous forest climate and humid continental climate, and the northern polar region is polar long cold climate.