For proof, just ask 19-year-old Cedella Roman, who went out for a jog on the beach in British Columbia, inadvertently crossed into the USA, and was held for two weeks by US border authorities, reports the CBC.
Ms Roman, who had gone to Canada to visit her mother and practice her English, insisted to the officers she did not see any warning signs, and at first did not realise how serious the matter would become.
As Roman turned to head for home, she was apprehended by two U.S. Customs Border Protection officers.
"He started telling me that I had crossed the border illegally and I told him I really did not do it on objective", Ms Roman told Radio-Canada (in French).
Instead she was taken over 100 miles away to Tacoma Northwest Detention Centre, run by the Department of Homeland Security.
"I did not think they would put me in jail", she said. "They asked me to remove all my personal belongings with my jewelry", she said. "They searched me everywhere".
Roman was released on June 6, after her mother, Christiane Ferne, provided immigration officials with her daughter's paperwork and authorities in both the US and Canada determined that the jogger could return to Canada.
"It was just unfair that there was nothing, no sign at the border", said Roman's mother Christiane Ferne. "It's like a trap.anybody can be caught at the border like this".
Noting that her steps had been captured on security cameras monitoring the area, the officers detained the teenager and accused her of crossing illegally into Blaine, Washington.
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Roman was likely jogging in Peace Arch Historical State Park, which lies between Blaine, Wash., and British Columbia, Canada, where people often play football and enjoy picnics.
A video by insh.world and posted to YouTube explores the interesting border along the 49th parallel and the exceptions to the "no touch zone", which includes Whatcom County's own Point Roberts.
A giant portal stands at the worldwide border between the United States and Canada in Peach Arch Park, in Blaine, Wash., and White Rock, British Columbia, on August 14, 2002.
CBC News called U.S. Immigration and Customs Enforcement and Immigration Canada. Ferne brought her daughter's passport and Canadian student visa documents.
But things got more complicated as she was not carrying any government-issued identification on her at the time.
Immigration officials on both sides of the border declined to comment on the French national's case, citing privacy concerns. The family said they were not sure if Roman will be allowed back in the US. -Canada border until June 5, almost a week later.
"It is the responsibility of an individual travelling in the vicinity of an worldwide border to maintain awareness of their surroundings and their location at all times to ensure they do not illegally cross the border", said a CBP spokesperson.
"It is the responsibility of an individual traveling in the vicinity of an global border to maintain awareness of their surroundings and their location at all times to ensure they do not illegally cross the border".
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