Manneporte, Natural arch in Étretat, France.

The Manneporte is a white chalk arch at the Alabaster Coast in Normandy, the largest rock arch on that coast, projecting about 100 metres into the English Channel. Its face is crossed by brown-black bands of flint, and a large arch opening sits near the top. Through the opening a second, smaller arch and the sea horizon are visible.

The Manneporte is the largest rock arch on the Alabaster Coast, cut by the sea into a chalk cliff about 100 metres wide that runs northwest into the English Channel. Its chalk is crossed by brown-black bands of flint. In the 19th century Guy de Maupassant compared the opening to a Gothic portal wide enough for a ship under full sail, and Claude Monet painted it several times.

Guy de Maupassant (1850–1893) likened the Manneporte to a Gothic portal wide enough for a ship under full sail to pass beneath. Claude Monet painted the arch several times, and it recurred as a subject for painters working along this coast.

The arch stands about 100 metres out into the English Channel, southwest of the Pointe de la Courtine and northeast of the Aiguille d'Etretat. Coastal paths from Etretat lead to viewpoints over the arch; check tide times before setting out, as the water rises quickly at the base.

The chalk is crossed by brown-black bands of flint, visible as horizontal striations on the cliff face. Guy de Maupassant described the arch as a Gothic portal wide enough for a ship under full sail to pass beneath.