Which river forms the boundary between Maharashtra and Goa?

he Terekhol Fort is located at the river's mouth. Option A (“Mandovi”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option B (“Zuari”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option D (“Sal”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. The key concept is to match the water body with its basin, type, location and defining feature. Therefore the correct option, index and explanation consistently identify Terekhol. The Terekhol River (Tiracol) forms the boundary between Maharashtra (Sindhudurg district) and Goa at the northern tip of Goa. The Chapora, Mandovi, Zuari, and Sal are rivers that flow within Goa. The Terekhol Fort is located at the river's mouth.