Kumarakom was within the jurisdiction of the king of Thekkumkur while that kingdom existed, and it was usual to have fighting and competitions among local kings. Small boats called chundan vallam and veppu vallam were widely used among the local kings for their lightning attacks and fighting in central Travancore. During those days Vembanad Lake was a dangerous area; therefore the king of Thekkumcore kept soldiers in Kumarakom and constructed a fort at the entrance of Kottathodu in Kumarakom.
Soldiers were kept in certain areas of Kumarakom for protection against enemy attacks; some of those places still have "pada" (meaning war) in their names, such as Padakkalam and Padanilam. The remains of the fort's wall, six feet broad, can still be seen near the village office of Kumarakom.
Kumarakom is home to a wide variety of flora and fauna. Kumarakom Bird Sanctuary is a noted bird sanctuary where many species of migratory birds visit. The Vembanad Lake, the largest backwater in Kerala, is habitat for many marine and freshwater fish species and it teems with Karimeen (Pearl spot also known as Etroplus suratensis) shrimp (Metapenaeus dobsonii) common name Poovalan chemeen. The bird sanctuary extends over 14 acres (57,000 m²), and came into existence following preservation efforts from the government. It is a major tourist attraction.