Donald Trump has displayed some questionable geography knowledge by boasting of how "beautiful" his US-Mexico border wall will look in Colorado - a state that is not on the border.

The US president is unlikely to be trusted to give directions anytime soon after the embarrassing slip-up, which came while speaking to an audience in Pennsylvania.

Mr Trump was once again hailing the potential benefits of his infamous election campaign promise, and listed off the states where the wall is being constructed - New Mexico, Texas and.... Colorado.

TRUMP: "We're building a wall in Colorado. We're building a beautiful wall. A big one that really works." 😳 pic.twitter.com/tVgO95VIdW — Aaron Rupar (@atrupar) October 23, 2019

"We're building a wall in Colorado," he told the crowd.

"We're building a beautiful wall, a big one that really works, that you can't get over, you can't get under."


Plenty have been quick to pounce on the error, which Mr Trump has since insisted he made "kiddingly".

In a tweet afterwards, the Republican said people in Colorado would benefit from the wall even thought it will be built hundreds of miles to the south.

State governor Jared Polis was among those to mock the president on social media.

The Democrat tweeted: "Well this is awkward... Colorado doesn't border Mexico. Good thing Colorado now offers free full day kindergarten so our kids can learn basic geography."

Well this is awkward ...Colorado doesn’t border Mexico. Good thing Colorado now offers free full day kindergarten so our kids can learn basic geography pic.twitter.com/bEXLDJYUku — Jared Polis (@GovofCO) October 23, 2019

Is Colorado on the border?! pic.twitter.com/0urD4E6C5Y — Zach Braff (@zachbraff) October 24, 2019

Mr Trump remains convinced that the wall will stop possible threats from the Mexican side of the border.

He visited a newly constructed section of the barrier last month and described it as "virtually impenetrable".

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Mr Trump added: "When the wall is built, it will be virtually impossible to come over illegally, and then we're able to take border control and put them at points of entry."

Image: Mr Trump has signed his name on a section of the wall

The US Supreme Court gave permission for the wall to be built in July at a cost of $2.5bn (£2bn), after Mr Trump imposed a record-long government shutdown due to Congress' reluctance to approve funding for the project.

Congress eventually gave him approximately $1.4bn (£1.1bn), and he bolstered the budget further by declaring a national emergency so he could take cash from other government accounts.