The Yvelines Diagonal 2027

If you’re looking for an adventure that smells like the forest, trails and castles, The Yvelines Diagonal in Breuil-Bois-Robert ticks every box 🌲.

Here, you come to cross the Yvelines through the undergrowth, along lanes that crackle under your shoes, and past heritage spots that pop up when you least expect them 🏰.

You choose your diagonal: 23 km to treat yourself and finish with a smile, 50 km to truly feel like you’ve “gone on a trip”, 80 km for a big getaway, or 103 km to come back with a real story to tell 🧭.

And after the effort, stay in the area: head to Mantes-la-Jolie for a stroll along the Seine, take a detour to the Château de Thoiry (perfect as a pair or with the family), or aim for Versailles if you want to extend the “castles” theme on a grand scale. If you prefer simple and effective, settle on a terrace nearby and replay the story of your run without rushing ☕️.