Synthetic aperture radar (SAR) imagery of gravity waves in the marginal ice zone (MIZ) was acquired during 1987 and 1989 using aircraft flying over the Greenland Sea. The dominant gravity wavelengths acquired during 1987 exhibit a systematic lengthening with penetration distance into the MIZ for three different regions examined. The extracted dominant wavelengths were analyzed using a linear least squares fit with penetration distance and a flexure-gravity wave model to estimate mean ice thickness. The extracted mean thickness varied from about 1¿0.4 m near the ice edge to approximately 2¿0.4 m near the deepest detectable penetration of the waves (about 20 km). These thicknesses are in agreement with 31 in situ measurements taken in the Fram Strait MIZ within 2 weeks of the SAR measurements. We also acquired wave imagery across a 150-km section of newly forming ice called the Odden, a tongue-shaped region, during 1989. These SAR images at L, C, and X bands display small wave modulation signatures at the northern edge of the Odden which we interpret as arising from rapidly growing new ice. ¿ American Geophysical Union 1994