On Saturday, President Donald Trump cited the city of San Antonio as a place where a border wall has been effective.

The problem: The central Texas city is more than 150 miles from the closest border crossing and, as such, has no wall.

Trump cites San Antonio as an example of a city where a border wall has worked. It’s located 150 miles north of Mexico and there is no wall. pic.twitter.com/CyiOiGuCy3

— Adam Best (@adamcbest) January 19, 2019

Trump’s geography mistake was pounced on by proud Texans who brutally mocked the president’s error online and in Texas media.

Here are some of the best tweets on the subject.

You know San Antonio home of the Spurs, the Riverwalk, the Alamo and the Great Wall of San Antonio pic.twitter.com/cJzgU1THQC

— dzigner210 (@dzigner210) January 19, 2019

#TBT I bet he said San Antonio because that is the one city he knows which sounds Latino enough to be close to Mexico. He is going to cite Dos Equis or Corona next because that is a lot easier #realtalk #NotMyPresident

— Gage Glass (@gingertweetter) January 19, 2019

Glad we've protected the famously vulnerable border town of San Antonio… https://t.co/9RinfNHvSX

— Morgan Ross (@MorganBRoss) January 19, 2019

I have been to San Antonio and I must have missed the wall there!! Saw the Alamo, where Mexico whipped our ass though!! 😳😳😳 pic.twitter.com/sS2zGLzCu0

— Alive Chapman (@AliveChapman) January 19, 2019

This man truly is dumb as a bag of rocks.. THERE IS NO DAMN WALL IN SAN ANTONIO!!! https://t.co/L3OphfOuDn

— Steveland J. Wonder (@TheRealStevieJ) January 19, 2019

San Antonio is 157 miles from the southern Texas border. #PSA pic.twitter.com/ha3BQcbOWb

— Son of Karas (ラの息子) (@QuandaryMan) January 19, 2019