Hundreds of thousands of migrants try to get from South America to the United States each year. But first, they have to get past the treacherous Darien Gap, a 70-mile stretch of dense jungle. WSJ’s Juan Forero explains the booming business that has cropped up to help smuggle migrants through — or around — it. Further Reading: - Smuggling Migrants Toward the U.S. Is a Booming Business  - To Avoid the Jungles of Central America, Migrants Are Taking a Treacherous Sea Route  - Masses of Migrants Overwhelm Panama’s Darién Gap  Further Listening: - Texas Took On Border Security. Is It Working?  Learn more about your ad choices. Visit megaphone.fm/adchoices