Partly on account of its strategic position, Conflans-Sainte-Honorine is considered the capital of the French inland waterways, and the right bank of the River Seine is still lined with barges (although these are now used mainly as houseboats).
Karena posisinya yang strategis, Conflans-Sainte-Honorine dianggap sebagai ibukota jalur air darat Prancis, dan tepi kanan Sungai Seine masih dipenuhi kapal barang (meskipun saat ini digunakan sebagai kapal rumah).