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25 July 2018, 18:26 | Updated: 25 July 2018, 18:37
The Welsh cyclist has got full control of the world famous race as he extended his lead while Sky team-mate Chris Froome slipped back to third overall on stage 17.
Movistar's Nairo Quintana won at the Col du Portet to move back into the top five, but Froome lost contact with the main group of contenders around two kilometres before the summit.
Geraint picked up four seconds on the road and four bonus seconds for third.
He now leads by one minute and 59 seconds from Team Sunweb's Tom Dumoulin.