All of the large walled plains have a slightly convex floor, following the curvature of the Moon's surface. Schickard, one of the largest, has an even greater curvature. As a consequence, it has been partially flooded at its north-west and south-east ends. These appear darker than its central portion, which is still 700' higher.
To its south-east is Nasmyth, and tangent to that the larger Phocylides.
Photo: Steve Massey. The full size original of this and other astro video camera images may be seen on his Astronomy Page.