At 100–150 m in width and 5–6 km in length, the density of mangroves in the eastern side of Muthupet lagoon is comparatively lower than other areas. Tamil Nadu Forest Department has excavated several canals across the mudflat. Each main canal, which enhances the water movement between sea and lagoon, has several sub canals on either side with a substantial number of mangrove seedlings. The western side has a protruding land pocket has formed an islet-like structure. This part of the lagoon lies near Koraiyar river mouth with small mangrove patches.