This is a medieval manuscript illumination depicting a large, brown sea monster. The creature is roughly oval-shaped and appears to be partially submerged in water, indicated by a wavy green line at the bottom of the image. The monster has a distinct head with a visible mouth and what appears to be a tooth or tusk. Its body is covered in radiating lines, suggesting scales or texture. The background is a warm, golden-yellow color. The entire image is framed by a decorative border consisting of a blue line with repeating red and white patterns along the edges. The style is characteristic of medieval art, with simplified forms and a focus on symbolic representation rather than realistic detail.