Guernes

The Château de Rosny-sur-Seine is a château in the Louis XIII style, situated in Rosny-sur-Seine in Yvelines, on the left bank of the Seine, at a short driving distance from Paris by the road to Rouen. It is famous as the seat of Maximilien de Béthune, duc de Sully, who retired to the old château to heal from his wounds at the battle of Ivry, 1590, and constructed the present building on old foundations in the closing years of the 16th century. It went through several substantial alterations in the 19th and 20th centuries, and a period of neglect in the 1980s and 1990s. As of 2004, it is under renovation.

Rosny-sur-Seine (French pronunciation: [ʁoni syʁ sɛn], literally Rosny on Seine) is a commune in the Yvelines department in the Île-de-France in north-central France.

Méricourt (French pronunciation: [meʁikuʁ]) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Rolleboise (French pronunciation: [ʁɔlbwaz]) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Mousseaux-sur-Seine (French pronunciation: [muso syʁ sɛn], literally Mousseaux on Seine) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Jouy-Mauvoisin is a commune in the Yvelines department in the Île-de-France region in north-central France.

Perdreauville is a commune in the Yvelines department in the Île-de-France in north-central France.

Buchelay (French pronunciation: [byʃlɛ]) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Fontenay-Mauvoisin is a commune in the Yvelines department in the Île-de-France in north-central France.

Freneuse (French pronunciation: [fʁənøz]) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Magnanville (French pronunciation: [maɲɑ̃vil] ) is a commune in the Yvelines department in the Île-de-France region in north-central France. It was one of the thirty communes in the Communauté d'agglomération de Mantes-en-Yvelines, merged into the Communauté urbaine Grand Paris Seine et Oise in 2016.

On 13 June 2016, a police officer and his partner, a police secretary, were stabbed to death in their home in Magnanville, France, located about 55 km (34 mi) west of Paris, by a man convicted in 2013 of associating with a group planning terrorist acts. Amaq News Agency, an online outlet said to be sponsored by the Islamic State of Iraq and the Levant (ISIL), said that a source had claimed that ISIL was behind the attack, an assertion that was later validated.Prosecutor François Molins said the attacker, Larossi Abballa, appeared to be acting on a recent general order from Abu Bakr al-Baghdadi to "kill miscreants at home with their families" during the month of Ramadan. On 18 June, prosecutors charged two men, on suspicion that Aballa was not acting alone. One of them was released seven months later, in January 2017, under court-supervised parole.