 From there, the River Eea runs past Green Bank and through Cartmel and Cark before flowing via Sand Gate Marsh into the estuary of the River Leven at Lenibrick Point, close to Chapel Island.It is now used as a fieldwork study point for the Castle Head Field Studies Centre where students are able to measure variables of the river such as the stream velocity, width, depth, turbidity, pebble roundedness, sinuosity etc.The name may be derived from a plenty of eels gathering in its lower course during high tides ("eea" was a Viking word for eel), or from the Old Cumbrian "ia" (ice), or the Old English "ēa" (a river).