Fontenelle petit cratère de 38 Km et profond de 1750 m (en bas à gauche) est situé à la frontière de la mer du Froid (Mare Frigoris) et de la région polaire boréale ou s’étendent des restes de cratères tel Birmingham (92 Km) au nord-est qui est fortement délabré et dont la surface est tourmentée par des monticules et crevasses. Fontenelle est bien circulaire avec des  murs peu élevés. Le fond plat est rempli de lave avec un cratèrelet au point médian.

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Fontenelle is a lunar crater that is located along the northern edge of Mare Frigoris, in the northern part of the Moon. To the northeast is the remnant of the Birmingham crater. Due to its location, this crater appears oval in shape when observed from the Earth because of foreshortening.

The rim of this crater is generally circular, but the edge is irregular and in some locations has a notched appearance. This is particularly true along the southwest and the eastern edges. The rim projects above the surface of the Mare Frigoris, and a wrinkle-ridge runs several crater diameters to the southeast from the edge. The western rim is attached to rough terrain to the west and northwest.

The interior of the Fontenell crater has a wrinkled appearance along the northern rim. There is a low, wide central hill at the mid-point, and some rough ground to the west of this rise. Only a few tiny craterlets mark the surface of the floor.

To the south of Fontenelle on the lunar mare is a tiny crater that is surrounded by a blanket of high albedo material. This crater displays a resemblance to the Linné crater on Mare Serenitatis. This feature lies about 15 kilometers north-northwest of 'Fontenelle G', and lacks a designation.

To the east of this crater is an unusual geometric configuration in the surface with an angular shape. This came to be known as "Mädler's Square", after the lunar selenographer Johann Mädler. It is roughly square in shape, but appears lozenge-shaped due to foreshortening. This feature was noted in many early books concerning the moon.