Ocean currents, referred to as neerukal, are classified by direction. Based on the study, various local names are used by coastal communities to describe the different types and movements of water, each with distinct characteristics and associated marine life. For instance, Karaneeru refers to water movement from land to the deep sea, while Poraneeru indicates the opposite—from deep sea to land. Thekkanneeru and Thengaraneeru denote currents from the south to north and east to northwest, respectively, both characterized by clear water and the presence of sardines and mackerel. In contrast, Vadakkan neeru and Vadakara neeru flow from the north to south and northeast to southwest, respectively, and are marked by turbid water supporting a diversity of fish species. Vadapurath neeru, moving from northwest to southeast, has no specific noted characteristics. Thembarath neeru, or Themma vellam, flows from southwest to northeast and is associated with fewer fish. Menneeru and Ullu Neeru are surface and seabed currents, moving north and south, respectively, though their characteristics are less defined. Valu vellam or athavellam refers to undercurrents that typically carry fewer fish. Azhikomban describes strong waves occurring at the estuary mouth. Karavellam or Polavellam refers to turbid rainy water on the surface that floats on top of the seawater, forming a thin surface layer; sometimes fish might become immobile in this water. Among fishers, there is a saying: “Neerarinju Valayidanam,” which translates to “Cast your net after understanding the water current.” Metaphorically, it is often used to mean that one should understand the situation before taking action. These local classifications of currents offer valuable insight into traditional ecological knowledge and how coastal communities perceive and interact with their marine environment according to the direction of the current and its characteristics. the knowledge about currents are very important in fishing and in navigation.