Coastal filaments were observed during research cruises led within the framework of the Monsoon Intra-Seasonal Oscillation in the Bay of Bengal (MISO-BoB) project. These observations raised several questions, such as what caused these filaments to appear. Additionally to in-situ data, we relied on satellite measurements of altimetry, and sea surface temperature, among other ocean variables to further our understanding of these features. Altimetry records from 1993 to 2020 highlight that coastal filaments were detected every year, but also that they could be seen off both the northwestern and southwestern coasts of the Bay, as well as south of Sri Lanka. Here, we theorize that they are associated with mesoscale eddy stirring, a mechanism found in other parts of the global ocean.